Looks to me like your phone is already rooted. Or at the least has been seriously messed with. You have 3 mismatches in the info you posted. MDC baseband with 4.3, then complilation of MK2. These are all different versions. You need to figure out the exact configuration of your phone before we can proceed with helping you.
Phones & Tablets: Galaxy S4, Galaxy Note 8", Evo 4g LTE, Evo 3D, Acer Iconia A500, Samsung Galaxy Tab 2 10.1, Ipad 2, Nabi 2,
Rom: Rooted Stock Odexed, Hotspot Mod, Xposed, Wanum, several other xposed tweaks