Google indexing pages not there

[archerford]

I've noticed alot of strange URL request in my server log and I'm trying to figure out what's going on. Google is indexing pages like www.mydomain.com/photos/software_crack.html, but that file is not on my server. If I do a search from Google or Yahoo for that page and click on the link , it takes me to a page that doesn't belong to me, but the address in the address bar is mine. However if I type the link in directly to the browser, the server returns a 404 error, like it should. It seems like the 404 page is being redirected when requested by a search engine. I've looked at my .htaccess files and don't see anything out of place. Does anyone know what's going on or how I can fix it ? Thanks.

[Treason]

Did you at one point in time have these links up?

[archerford]

No, they are not links to old files. I believe I have found the problem. I have a PHP script that will upload pictures from a clients computer and the directories have permissions setting of 777. Someone had upload a redirect script into these directories.