Determining New Zombie CR's for 5e

[Tevin]

A little bit of hiatus but I'm back with another custom zombie for 5e that I need help determining CR for. I think it's around CR 3, or maybe 4, but I'm looking for your opinions on what you think and why.

Feral
Medium Undead, neutral evil

Armor Class 15 (natural armor)
Hit Points 52 (7d8+21)
Speed 40ft

Str 18 (+4) Dex 16 (+3) Con 16 (+3) Int 3 (-4) Wis 6 (-2) Cha 5 (-3)

Wisdom Save +1
Damage Immunities Poison
Condition Immunities Poisoned
Senses Darkvision 60ft, Passive Perception 8
Languages Understands what it spoke in life but cannot speak

Actions
Multiattack: The Feral makes three attacks: two with its claws and one with its bite.
Claws Melee Weapon Attack: +7 to hit, reach 5 ft., one target.
Hit: 7 (1d6+4) slashing damage
Bite Melee Weapon Attack: +7 to hit, reach 5ft, one target.
Hit: 8 (1d8+4) piercing damage

Feral Leap: As a bonus action, the Feral can jump up to 20 feet. If the Feral lands adjacent to an enemy at the end of this jump he may immediately make a Strength (Athletics) check to grapple that enemy.

Undead Fortitude: If damage reduces the feral zombie to 0 hit points, it must make a Constitution saving throw with a DC of 5 + the damage taken, unless the damage is radiant or from a critical hit. On a success, the zombie drops to 1 hit point instead.