Attaching heavy cupboard to plasterboard wall

Attaching a cupboard which weighs weight:14,7 kg to a wall in my house. It's an internal wall. Wall is plasterboard on timber frame (I'm guessing).

House is about five years old.

Cupboard is FAR HEAVIER than I originally had planned for.
Dimensions are
Width: 120 cm
Depth: 28 cm
Height: 35 cm (link to cupboard spec)



Also the places where you attach cupboard to the wall are fixed - holes at the top left and right hand of each corner.

I had wanted to make it a shelf in my utility room and put it up against the ceiling.

Plan now is to put it up over door. "Rest" the cupboard(shown in broken line) on the door frame and have brackets(show XXX but obviously the other way round) from the top of the cupboard which will attach to the plasterboard and timber either side of the door frame. (door frame in *) Assusming that there is a timber frame either side of door (timber frame x)

x x
x x
XXX XXX
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| x
| | x
| | x
| | x
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| x
x ********************** x
x * * x
x * * x
x * * x
x * * x

Are these screws from Aldi good enough to use to attach it to the timber frame?

If not, what's the best thing to use?

Thanks