How fuselage creates lifting force when plane flying on a side?
The photo that you posted already gives quite a few hints on how this can be possible:


The aircraft is flying at a sideslip angle (the nose pointed slightly up), so a part of the thrust vector is counteracting the weight.
It seems like the aircraft is not exactly perpendicular to the surface, so a part of the lift vector is still counteracting the weight.
The vertical stabilizers produce some "lift" in this situation due to the sideslip angle mentioned in 1. Note that these typically have symmetrical airfoils, so without the sideslip angle, these would not create any force.
The aircraft might be descending in a controlled way. In that case, not all of the weight must be carried.


As an example, look at the high sideslip angle here: 
                
            . There you can also see the rudder being deflected for trimming.