Somebody implanted links on my website to their horrible spammy viagra/cialis sites. These links are revealed when I use the Fetch as Googlebot option in Google's webmaster tools, as well as when I run a site: query on google.com.
How do I clean these from my site? They don't show up in my code, so I can't just delete them. Is there a tool I can run to disinfect my site? It's running on a shared server at bluehost.
Any help greatly appreciated.