Linux is immune to malware, but is by NO means immune to dedicated attacks.
Linux will not suffer from windows malware, and neither will the suffer from infected webpages.
As a OS it really has not much to worry about fact is tho that as a linux user you need to worry about hack attempts as those if successful will plant malware and then you get things like the article you posted.
but as a linux user myself i know for a fact that there are a few wild linux virusses out there but they willl not reach you if you secure linux the way it should be done and if you make sure that you got all the eggs in the basket.
Running a server is very different from running a linux pc, and security is a much bigger concern.
But then again in terms of security CENTos and Debian if properly configured and compiled are by default 100 times more secure then a upto date well secured windows box.
But yeah Linux boxes can be hacked, and during this they can be infected with custom malware.
If Linux is not subject to attack then infecting it is near impossible.
There are many misconceptions around Linux security, and attacks are not something only Windows users need to worry about. The main threats facing Linux systems aren't zero-day vulnerabilities or malware, but things such as Trojanized applications, PHP backdoors, and malicious login attempts over SSH. ESET recommends webmasters and system administrators check their systems to see if they are compromised, and has published a detailed reportpresenting the findings and instructions on how to remove the malicious code if it is present."