Comment 35 for bug 224971

I've already said that in earlier comment:
The string "?action=AttachFile" should be blacklisted in robots.txt - then Google bot won't download these attachments and won't push up the pagerank of the spammers' sites.
This is an easy and 100% sure fix.
This will remove all wiki page attachements from google though.
It will solve this issue because Google bot will refresh it's cache after a few days, and then these spam pages will get a lower rank.