Malicious PDF — malware analysis report

Static analysis result for SHA-256 7407c1dabc9a630f…

MALICIOUS

PDF

87.7 KB Created: 2021-06-30 01:19:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 00b819c297bf523a9705d5c10370a19c SHA-1: a3c0259ccb89832cfa4deb35f3df5fd0a1d6c6d1 SHA-256: 7407c1dabc9a630fee8940e8b13369ef080c9f6845941f599961437a5c174dc4
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to other PDF files hosted on compromised websites, suggesting a link farm for SEO manipulation or to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804a2f4df0f---vojanutixowigatawumaj.pdf
    • http://wumag.pl/userfiles/file/23899294353.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/8nidhaugaeqm314lskcgo95njn/7409333073.pdf
    • http://alliance-ic.ru/uploads/file/xerofijafenibarudezisaso.pdf
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/a78e9ab6da9d26deee5a51042b6c4222/62718040572.pdf
    • http://dientrotiendathc.com/media/ftp/file/38913684628.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/85c629ae6d6fb1ee749f2f293ea0c145/sapuneraxivato.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1607beb41812f0---bijizufux.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16078ed7b08a2d---87358635744.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/3la5m4gglu5fljqr0g61o7mu0j/kasikikinawibuzusob.pdf
    • http://lezeckastenakosice.sk/upload/files/saruvaxasusa.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c065b80f63f---fawerojuvidomif.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/eee143bca915b496838b532d9d13c770/zojezepakobel.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759ac16c219---xofasawuxirawesozuj.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/i7cta8r096p50bmgis3r46ah37/furalafiguvu.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/f7be420154a5b2152eaf0077d601191f/medusu.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cb46355cb---sufojuradim.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/7da777ddf362e4c85d4bc2598a867986/tedoralovimaje.pdf
    • http://bollywoodsalonskokie.com/admin/images/file/22747818957.pdf
    • http://www.awakohchang.com/image/upload/File/7171049319.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbc2d34ceb---26360717464.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/op6i15tvajebghqocji4hd1r5e/17350448607.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b252e57b64f---97959380487.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca604a6e89---44386216806.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=gta+vice+full+game+download+for+pc
    • 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_off0000f0c2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C2 16792 bytes
font_01_sfnt_off000108d4.bin
fa3e92f3d5556483695b36d946e854e07f783633e1976666eeff7866043bb14f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108D4 18432 bytes
font_02_sfnt_off000137f5.bin
527fe081130496445040184add5f0f16455934ee747aee64b4a42c30336b3f3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137F5 11088 bytes

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