The result moved the R's three points clear of the drop zone, but Ferdinand has refused to accept that the club is now safe.
"It's a massive win that could push us on to safety but we're not safe yet. We can't for one second think that we're safe," Ferdinand told the club's official website.
"Now it's time to try and get something away from home next weekend and carry on the form that we're showing at home."
Ferdinand joined QPR from Sunderland in 2011.