The 29-year-old has signed a two-year deal after his contract at Easter Road came to an end.
The ex-Scotland international previously played in Russia for a year with Lokomotiv Moscow back in 2006.
O'Connor scored 12 goals in 33 games for Hibs last season in a second spell with the team.
Restore Data
| Team | P | W | D | L | F | A | GD | PTS | |
| Championship Group | |||||||||
| 1 | Celtic | 2 | 2 | 0 | 0 | 85 | 27 | 58 | 84 |
| 2 | RangersRangers | 1 | 1 | 0 | 0 | 74 | 24 | 50 | 78 |
| 3 | Hearts | 2 | 0 | 1 | 1 | 46 | 37 | 9 | 63 |
| 4 | Kilmarnock | 1 | 0 | 1 | 0 | 43 | 34 | 9 | 52 |
| 5 | St Mirren | 2 | 1 | 0 | 1 | 42 | 46 | -4 | 46 |
| 6 | Dundee | 2 | 0 | 0 | 2 | 46 | 59 | -13 | 41 |
| Relegation Group | |||||||||
| 1 | Hibernian | 2 | 1 | 0 | 1 | 48 | 54 | -6 | 42 |
| 2 | Aberdeen | 2 | 2 | 0 | 0 | 37 | 49 | -12 | 41 |
| 3 | Motherwell | 2 | 1 | 0 | 1 | 50 | 53 | -3 | 40 |
| 4 | Ross County | 2 | 1 | 0 | 1 | 34 | 59 | -25 | 33 |
| 5 | St Johnstone | 2 | 0 | 0 | 2 | 25 | 50 | -25 | 31 |
| R | Livingston | 2 | 1 | 0 | 1 | 25 | 63 | -38 | 21 |
| First Phase | |||||||||
| 1 | Celtic | 33 | 24 | 6 | 3 | 80 | 26 | 54 | 78 |
| 2 | RangersRangers | 33 | 24 | 3 | 6 | 72 | 23 | 49 | 75 |
| 3 | Hearts | 33 | 19 | 5 | 9 | 46 | 34 | 12 | 62 |
| 4 | Kilmarnock | 33 | 13 | 12 | 8 | 43 | 34 | 9 | 51 |
| 5 | St Mirren | 33 | 12 | 7 | 14 | 38 | 43 | -5 | 43 |
| 6 | Dundee | 33 | 10 | 11 | 12 | 44 | 54 | -10 | 41 |
| 7 | Hibernian | 33 | 9 | 12 | 12 | 44 | 51 | -7 | 39 |
| 8 | Motherwell | 33 | 8 | 13 | 12 | 46 | 51 | -5 | 37 |
| 9 | Aberdeen | 33 | 8 | 11 | 14 | 35 | 49 | -14 | 35 |
| 10 | St Johnstone | 33 | 7 | 10 | 16 | 24 | 46 | -22 | 31 |
| 11 | Ross County | 33 | 7 | 9 | 17 | 32 | 56 | -24 | 30 |
| R | Livingston | 33 | 3 | 9 | 21 | 22 | 59 | -37 | 18 |
| > Scottish Premiership Full Table | |||||||||
