[NL50 SH] TP against calling station : call shove on river?

[SlimboKarvell]

Hello,

Villain is a passive calling station, saw him once min-check-raise on a dry flop an folding to a bet on the river. His stats after 68 hands are 38/0/0.87.

I bet the river this weak to induce a bluff and/or to make him call with crap. He called a lot and folded on the river. Even if I induced a bluff with this weak bet, I can't call this river shove or is it possible he does this as a bluff.

Thank you

Full Tilt Poker
No Limit Holdem Ring game
Blinds: $0.25/$0.50
6 players
Converter

Stack sizes:
UTG: $57.05
UTG+1: $29.50
CO: $46
Button: $72.10
SB: $50.45
Hero: $71.90

Pre-flop: (6 players) Hero is BB with K[img]/images/graemlins/diamond.gif[/img] 9[img]/images/graemlins/diamond.gif[/img]
UTG folds, UTG+1 calls, 3 folds, 3 folds, Hero checks.

Flop: 6[img]/images/graemlins/spade.gif[/img] 7[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/spade.gif[/img] ($1.25, 2 players)
<font color="#cc0000">Hero bets $1</font>, UTG+1 calls.

Turn: 3[img]/images/graemlins/heart.gif[/img] ($3.25, 2 players)
<font color="#cc0000">Hero bets $2</font>, UTG+1 calls.

River: 3[img]/images/graemlins/club.gif[/img] ($7.25, 2 players)
<font color="#cc0000">Hero bets $2.5</font>, <font color="#cc0000">UTG+1 raises to $25</font>, Hero folds.
Uncalled bets: $22.5 returned to UTG+1.

Results:
Final pot: $12.25