Originally Posted by
Aus_Mal
The links are an attempt to increase their ranking in Google.
Basically, Google uses (amongst many other things) the interconnectivity of sites in their ranking routine, so they're hoping that your site will help bump them up in google searches.
A recent bit of information regarding this is here:
http://www.avertlabs.com/research/bl...rch-poisoning/
I thought phpBB has introduced various anti-spam features in later editions. Perhaps worth checking out their webpages - eg perhaps
http://www.phpbb.com/community/viewt...f=46&t=1437125
Otherwise there are other forum softwares which often update their forum software to enable better control over rogue posters.
Ah, thanks!. I was afraid something truly malicious was going on. At least this is relatively benign. All of these seem to be coming from the same range of IP addresses (hosted in South Africa) and link to porn on a Polish website. I may just block the entire IP range -- it's simpler than trying to change the web forum software, though I will check the phpBB webpages for additional info.