So, what person on your net it trying to connect to a web server on
188.8.131.52? (Actually, it looks like some web forum.) Is your host infected, or are you just trying to autoload some site?
It could be that your router is mis-configured, but any time you see traffic from a "high" port (over 1025) to a "low" port on a remote site, the odds that the traffic did NOT originate on your host are about the same as finding that your neighbor is actually an extra-terrestrial - it's possible, but EXTREMELY unlikely.