PakBugs.com is online after the offline period of several days.
Some of the forum's articles generate 500 Internal Server Errors or typical 404 errors at time of writing.
The underground forum is known about hacking tools, selling CVV codes etc. The forum has more than 12 000 registered members.
I wrote about the forum's userlist disclosure on unmoderated security mailing list in Tietoviikko magazine's article yesterday (link here in Finnish).
Update: The forum is gone - again.