Dishonest and illegal. (Cambridge Dictionary)
Characterised by, involving, or proceeding from fraud, as actions, enterprise, methods, or gains. (Dictionary.com)
Given to or using fraud, as a person; cheating; dishonest. (Dictionary.com)
Characterised by, based on, or done by fraud: Deceitful. (Merriam – Webster)
Obtained, done by, or involving deception, especially criminal deception. (Oxford Dictionaries)
Unjustifiably claiming or being credited with particular accomplishments or qualities. (Oxford Dictionaries)
Top ten ways to spot a fraudulent website.
Four Ways To Identify Fraudulent Worker’s Compensation Claims.