The towering 6ft 6in (1.98m) Fundora used his height and reach advantages to dominate his Albanian opponent in an attritional 12-round contest.
Fundora sealed victory just before the bell rang at the end of the 12th round, flooring Hadribeaj with a brutal left hand that sent his opponent sprawling.
Earlier, Hadribeaj had made a bright start, connecting with a series of stiff jabs in the opening round to rock Fundora.
But Fundora asserted his dominance in the second round, wobbling Hadribeaj with a left hand and forcing the Albanian onto the defensive.
Fundora continued to score regularly, and a frustrated Hadribeaj had a point deducted in the third round for excessive holding.
A flurry of Fundora uppercuts in the fifth round left the 28-year-old from California in control and he remained comfortably ahead on points over the closing rounds.
Another Hadribeaj point deduction for holding in the 11th round left the challenger needing a stoppage to have any chance of snatching victory.
But Hadribeaj's aggressive approach to the 12th round left him open, and Fundora duly pounced to floor his opponent after 2 minutes and 59 seconds of the 12th round.
Fundora improved to 25-1-1 (17 knockouts) while Hadribeaj fell to 23-1-1.