Crawls For Warez And Cracks From Yahoo And Google

I noticed in the apache error logs that Yahoo and Google (mostly Yahoo) have been crawling one of my clients' sites for warez, cracks and serials, but these files don't exist (and hence they're ending up with 404 errors in the error logs).

The IPs that are doing this are legit (as far as I can tell)... 74.6.20.32, 74.6.74.50, 66.249.65.178

It's systematically hitting the server once every second or two, looking for files such as "free.serial.no.of.flash.professional.8.jsp", "trainer.SimCity.4.million.jsp", "Paragon.Partition.Manager.v.7.crack.jsp"

and this has been happening for at least a day now.

Now here's the thing. The site has gone through a redesign about 4 months ago, and the previous site was running an old version of PHP Nuke that was filled with spam (from tracebacks), and a photo gallery manager which was probably not installed securely. The new site utilizes Joomla, and all the previous elements are gone (in fact the site was migrated to my servers after the redesign, so my servers never hosted their old PHP Nuke or photo gallery).

These mysterious crawls from Yahoo and Google all seem to hit the photo gallery URLs, such as http://www.domain.com/albums/album01...v3.1.patch.jsp

The other weird part is, all the links end with .jsp. The site's previous server did not have JSP support, and neither does mine.

Also before we moved the site over to my server, I archived their entire website on their old server, and none of these files exist there.

Doing a search on Google on their site (site:www.domain.com) doesn't show any of these files. Searching Google for links that point to the site also don't show anything out of the ordinary.

This has me baffled... Does anyone have any idea what is going on?