Malicious PDF — malware analysis report

Static analysis result for SHA-256 a80f65fec96c4c39…

MALICIOUS

PDF

76.5 KB Created: 2021-06-30 08:42:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3d9a91642835cab669fd5e1677b86fb8 SHA-1: 8e896897f5b816d7e8c25dfc35e2b573db9bd849 SHA-256: a80f65fec96c4c3929988f925bde10541c1a1473e3d43a7c38c454d5845731d0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The embedded JavaScript is likely used to facilitate these redirects or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/b076f07aed41ec2c713eff88b54133a5/39356690060.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1609e154c751a1---kegelituvuvodibuvonodobi.pdf
    • https://aartipalette.com/userfiles/file/mapubexudazedezibawevidu.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/748597e5aa63735a2739fd0e7684aa07/vutezuramajasubisewutu.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8dcf9dc84---kotononi.pdf
    • https://esz.jp/img/editor/files/9525028525.pdf
    • https://terminal.hr/userfiles/file/nijolidone.pdf
    • https://guapa2.com/admin/fck/file/gotanobesogozavavep.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/69224c324759e9d1a1b175af779ab17f/zexejavuxefixekagum.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077415a40cba---42589240866.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f0abe9ad7---givejetor.pdf
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/26736943251.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609260ffe4bb5---wuzijonevafuparovonogosek.pdf
    • https://reazfarah.com/ckfinder/userfiles/files/85291394064.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/94915256743.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=potting+in+horticulture
    • 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_off0000cbde.bin
142c6559c10f45da2c4448e6930c8561541e38ad307ddf60254f50e57dce5c5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDE 10280 bytes
font_01_sfnt_off0000e2f5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F5 16792 bytes
font_02_sfnt_off0000fb07.bin
9e59c82026c9c6467f19c5bc9e8d8be42b49d99c44b9859cf4c609d8f15ce839		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB07 16464 bytes

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