why not just use the well-known ones?
the wallet was myetherwallet.com was it not well known?
It could have been a phishing site with a spoofed URL name resembling myetherwallet.com (but in reality it could have been myetherwaIIet or myetherwallet.se etc.)
Couple of things to remember -
1. Always remember to check the URL before entering your credentials (Check if there are any letters resembling other letters like mm or nn).
2. Always check for the Certificate to the left of the address bar (It should say Secure with a lock sign in Chrome, and similar icons for other Browsers).
Try to bookmark the authentic site once you visit it and always try to go to the site via your bookmark and never click on links forwarded via email/messenger/forum to login to a page. If you must visit, type in the URL so you know you are entering the right characters and not mistaking some characters in the link for some others.