Has my lockscreen been hi-jacked?

[hx2]

I haven't installed any apps recently... but all of a sudden my lockscreen has changed.
My lockscreen doesn't have any security settings... just swipe.
It use to just show my lockscreen picture, now it shows this....

https://drive.google.com/file/d/0BwGt_iRAq7GaMnZOelNDdUcwWmM/view?usp=sharing

I don't want this lockscreen, it has an AD on it...
Has my lockscreen been hi-jacked, if so... how do I fix it?

Samsung Galaxy S4

 

[Javier P]

There are some apps that are pushing ads on the lock screen, one of them is ES File Explorer. Take a look at this thread.

http://forums.androidcentral.com/showthread.php?t=640251
New Speed Charge/Battery Status Lock Screen with annoying ads "just appeared" on GN4