This KBA confirms if it is possible to add URL on Large Image Component on CSB.
SAP SuccessFactors Recruiting Marketing
As designed, there is no option to add image "URL" on "Large Image" component on CSB. Customer can refer to implementation guide for further information. Customer can submit an enhancement request for this feature.
2090228 - How to Submit Ideas for SAP SuccessFactors Products
Large image component, CSB, URL , KBA , LOD-SF-RMK-CSB , Career Site Builder , How To