For the time being, just leave these spam threads alone. I had been relocating them to advertisements to try to clean up some of the forums, but there's so many of them that it just pushes the crappy advertisements back to the top of the "newest" forum page.
Pet and the Mods are aware of it and will be sorting it out soon enough. Just leave the posts alone so that they don't get more of the attention they want.
Just my two cents.