Hacked content and injected spam

What is hacked content and injected spam?

Hacked content is any content placed on a site without the owner’s permission because of a security weakness. In SEO spam, attackers inject links, hidden keywords, whole spam pages or redirects to boost their own sites or send users to scams. Google’s hacked content policy covers code injection, page injection, content injection and malicious redirects.

Well-known patterns include the “Japanese keyword hack”, which creates thousands of auto-generated pages in Japanese selling counterfeit goods, and pharma hacks, which inject drug keywords and links. Attackers often cloak the spam so the site owner sees normal pages while Google sees the spam.

Google reports hacked content in Search Console’s Security issues report, not the Manual actions report. It is the black hat technique most likely to happen to a site whose owner did nothing wrong.

Why hacked content and injected spam matters for SEO

A hacked site can lose rankings, get flagged as unsafe and expose visitors to harm, all without the owner noticing for weeks. Outdated CMS plugins and weak passwords are the usual entry points.

Hacking someone else’s site to plant links is plainly black hat and illegal. If you see links from hacked sites in your own profile, someone may be using your domain as a target in negative SEO or as cover for a spam campaign.

Risks of hacked content and injected spam

• A security warning in Search Console and possibly in browsers, which drives visitors away.
• Spam pages indexed under your domain, demoting or crowding out your real pages.
• Users sent to scams or malware, with lasting damage to trust in your brand.
• Legal duties if personal data was exposed, such as breach reporting under data protection law like the GDPR.
• For the attacker: hacking is a criminal offence in most countries.

How to clean up a hacked site

1. Check the Security issues report in Search Console and search Google for site:yourdomain.com with spam terms (for example casino, viagra or Japanese characters).
2. Take a backup of the current state for investigation, then lock down access: change all passwords and remove unknown admin users.
3. Find and close the entry point: update the CMS, themes and plugins, and remove anything unused.
4. Remove injected files, pages, code and .htaccess rules; restoring a clean backup is often fastest.
5. Return a 404 or 410 for spam URLs so Google drops them, and check your sitemap was not altered.
6. Request a review from the Security issues report once the site is clean.
7. If personal data may have been exposed, follow your legal obligations to report the breach.

Hacked content and injected spam example

A site: search for a dentist’s website shows 4,000 results, most with Japanese titles about designer handbags, at URLs like /?shop=12345 that the dentist never created. Visiting them directly shows a normal page.