The best defense is not to click on links and not to download anything from members who have no reputation on the forum. What the forum should do is ban posting any links for newbies, or at least not allow them to be clickable.
Personally, I find it hard to click on links provided by this group of people you mentioned because you don't know how genuine it is. Most times when I see them drop links on their thread post, I don't hastily respond, sometimes I boycott the thread till I see that there has been others who have commented there and most of the times what you'd see are people saying the link is a phising one.
I also totally agree with this suggestion. Although this rule might affect those newbies who actually are genuine but because of how widespread this issue is getting, the good ones would have to suffer too.