Malicious PDF — malware analysis report

Static analysis result for SHA-256 634ef41f71fb0a55…

MALICIOUS

PDF

94.0 KB Created: 2021-06-25 14:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 516159e0a801080337c407b3446a5d05 SHA-1: b9e5b499f11f9424bbc9a3fd65369af2a5a88581 SHA-256: 634ef41f71fb0a55adff9d1528fcdf3fd66819635e2c5500c11de724d527c51a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/15a57ff9f94436a2d5f47c50557d9b68/kasepoxuxiketewavog.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160910f9f7cc0d---35388494028.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aeeff9a052---rilipegejasamatusizarefis.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607235574fde1---nedelezadowasekalowulemer.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/pgjp3fp8rjm3hbafum7ngo3jnn/wanakikosenudabutukexu.pdf
    • http://zjqzzx.com/uploadfile/file/2021061205245873499.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/cf74d3ad23543f94e24ac910d2cd3ee2/nexasenoroxadagunu.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e97548300f---pukemafojuligazufixesis.pdf
    • http://kulturazebrak.cz/userfiles/58660934459.pdf
    • http://shinies.ru/img/lib/file/sogigemixu.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a043d1c960a---50084664208.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1606f956f3d263---sabivuvimagabat.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16091c793709b2---19646267248.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/03e9bc84d4218b33a060bf281a562e86/7653420076.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac80b8dd124---2915317273.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=sequence+1+4+7+10
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f43e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF43E 16792 bytes
font_01_sfnt_off00010c50.bin
5e85a823fafe5a24254a0f3e380c71b13dfa7fe7efef3391cd7125412f0e2efd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C50 19156 bytes
font_02_sfnt_off00013f7b.bin
325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F7B 16084 bytes
font_03_sfnt_off000154a8.bin
5ebe3d6039f8e0a2d9670812f9860221fb829aac4a9a361af639135a19871886		 pdf-font-stream PDF embedded font (sfnt) at offset 0x154A8 10060 bytes

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