Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f0cdd3a48124519…

MALICIOUS

PDF

76.2 KB Created: 2021-07-03 02:34:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 46bfc71791200851231af287d2d5b837 SHA-1: a91eccb55ef441b434eb22615f3cb6e4e07307fe SHA-256: 3f0cdd3a48124519cb1e2a1f68b1899dbfe1b0183dca34b1eecdb24be7b791c0
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites and disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure suggests the PDF itself is the primary lure, relying on the embedded links to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://zivotzaokny.eu/res/file/pesaj.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/6cbb92596057fa9293573d6a7c981a92/sokaxan.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608fec2b471a9---rizes.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966900a4b51---kesavakasesogodepas.pdf
    • http://akgikorea.com/file_upload/fck_upfile/file/movaxek.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a951b8b65f---27203408091.pdf
    • https://cualuoihoanmy.com/uploads/userfiles/file/bufadavumuxemuman.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079bcbd7bdae---bajujaneb.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bed32147b---8809570145.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836b8e86429---kukatutosukijetiv.pdf
    • http://altelaw.com/uploads/image/file/17796600341.pdf
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608a36ebdbd2a---34958487866.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/9539b9799da07512213025f95a87e342/55919431304.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074d8ba855b0---dalebibexajamiv.pdf
    • https://edubox.mn/uploads/users/0/files/beliv.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/tjktdarj0018c9svdld4mn6qc6/burivopam.pdf
    • http://better-pharma.com/images/file/files/kewupawofaxetegufuwu.pdf
    • https://ht-cooling-j3t.com/contents//files/91813464788.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/oe08ro54tcum9vb1642fia0oh9/novapomarigakugirarobi.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/9bafc3ab77d59837ec0489929b181c18/31230817187.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5cd96685a---3803673022.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=mm2+value+list+2020
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c754.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC754 16792 bytes
font_01_sfnt_off0000df6b.bin
bbb001565e52b055f646cdd7d88a86126e5bbf0605317f7e136c30cb3aad8ffe
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6B 10348 bytes
font_02_sfnt_off0000f6e9.bin
81177764c1df9d54f2eb957d39efbdf53973b97cc9934a099b3f1ffeb6e13fe7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E9 17340 bytes