I got it too! It started yesterday.
I you go to the site (Do not do this if you use IE) it says you have won 10.000$ , but you have to enter your visa card details including the secret number
The site does look somewhat as an official Ladbrokes site, however any
sane person should realize it is fake since they would never ask for visa carddetails (as Ladbrokes allready have them) and
especially not your secret visa number. This does not mean that some will not still enter all the information. I had expected Ladbrokes to instantly warn everyone about the site, but it has not happened yet.
Maybe they target the client's (by trying random IP's) so it is not really comming from the server.
If you add /logs to the url, you can see the access log for the server. It has a LOT of traffic actually.
It was 5MB last night it is already 2MB again now.
Zoozie