You need hardware:
14 x Countersunk woodscrews: 3,5 x 30 mm or 3,3 x 20mm
4x M4 x 50mm (or longer)
1x M4 x 30mm (or longer)
5x M4 Nuts
3x Confirmat Screws 7x50 mm (optional)
3x wallscrews
Instruction
1.Remove the legs from the table. Remove screw from first leg.

TOP
2.Screw on part [1] (by woodscrews and / or Confirmat Screws).
3.To the table (on the opposite side, on the middle) screw on part [3] (use woodscrews only).


First leg (without screw).
4.Mount part [1] to the top (by woodscrews and / or Confirmat Screws).
5.To the same leg, but on the opposite side, mount part [4_Up] (use woodscrews only).

Second leg (with screw)
6.To the second leg, mount part [4_down] (on the side without the screw).
7.To the screw mount part 5.
8. Use screw M4 and nut to assembly two legs together


9. Mount two parts number 2 to the wall (choose the correct height, and level).

10. Assembly leg to the top by screw M4 and nut.

11. Assembly top to the wall (screw on part 1 and part 2).

12. Unfold leg and screw them together

13. Mount part [6] to the wall - see picture 10. Check hight for correct level of the top

So, you finished assembly parts.
Unfolded table:


Folded table:

and

The author hasn't provided the model origin yet.