Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d657c9d35ba6b95…

MALICIOUS

PDF

73.2 KB Created: 2021-06-20 09:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09af633eb723e2436682a8ba0c087453 SHA-1: 1ebeb4a89d38755d0a0238759e84aecd8bbf8b29 SHA-256: 4d657c9d35ba6b95d6ffb681ec7f634945c37a71fa53dca87ca9d2df9db570af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains metadata related to 'dragon ball budokai cheat psp' and the wkhtmltopdf application, which may be a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.ecostroyservis.ru/File/57915776116.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/638b592c47ba11d8bb2321ac28c2eee3/86506890228.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa5463865a---pivexemajem.pdf
    • https://actor-conseil.com/files/file/8252565963.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738f2592b9d---79727608793.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f3faa501c---golikapugudiwoxagufewagi.pdf
    • https://getadoc.in/ckfinder/userfiles/files/bojiradujirosunoxusa.pdf
    • http://nedirajtebosnu.net/userfiles/file/67468123660.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/81854537eb2b9a1768521bc65802cfdd/guraduluziroregina.pdf
    • http://freeski.hu/freeski/file/54500651689.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608263158cb10---91972077709.pdf
    • http://opakowania-loga.pl/zdjecia/fotki/file/62861306740.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607495656a344---7031910274.pdf
    • http://tms-operation.com/upload/files/kirezulu.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/73d71d209b57e91cab94440fac61105a/rimejejorodukog.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=dragon+ball+budokai+cheat+psp
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db31.bin
2ec7b706ec69596a904ea56e202f7d025ab8349997455b5931a7050d8a940511		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB31 5536 bytes
font_01_sfnt_off0000edfd.bin
1df016be2023f5cb7eb96bca4cbc182e69b37d76c6ec155648fc82bd83a8d077		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFD 12856 bytes

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