Latvia is definitely becoming a problem when it comes to black hat hosting. The 188.8.131.52/24 range (184.108.40.206 - 220.127.116.11) is another malicious block, forming part of AS2588 belonging to Latnet (similar to microlines.lv). At a rough calculation, roughly half the IP address ranges I am currently blocking are based in Latvia.
This bunch of domains is a mix of fake pharma sites, browser exploits, illegal downloads and possibly some hijacked domains. In any case, there is nothing of use here and either blocking the entire IP range, or the list below is probably a good idea.