Real-world analysis often requires combining directly queryable structured sources (e.g., SQL and CSV) with evidence preserved only in visual documents, such as scanned reports, invoices, and dashboards. Current analytics agents still focus primarily on structured and textual inputs, leaving this cross-modal setting underexplored. We introduce DataCross, a benchmark and agent framework for heterogeneous, insight-driven data analysis. DataCrossBench contains 200 end-to-end tasks across six fine-grained categories: Fund Analysis, FinTech, Internet Development, Internet Firms, Short-form Drama, and AI Healthcare, grouped into four macro sectors and mixing SQL/CSV/JSON/TXT sources with image-based evidence. The benchmark is built with a human-in-the-loop reverse-synthesis pipeline to preserve cross-source dependency while keeping the target insights verifiable. We further propose DataCrossAgent, which coordinates source-specialized agents through intra-source exploration, source prioritization, cross-source pollination, and Reasoning ReAct (reReAct)-based executable verification. Experiments show that DataCrossBench reveals a difficulty gap for most baselines, especially on vision-dependent Hard tasks, and that DataCrossAgent improves average factuality over vanilla GPT-4o from 0.3291 to 0.4270 (+29.7%) while showing a smaller Easy-to-Hard degradation than several baselines. These results position DataCrossBench as a practical testbed for cross-modal heterogeneous data analysis.