Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6f7253d5e62d124…

MALICIOUS

PDF

81.4 KB Created: 2021-07-23 10:25:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3aa981c64b43d45c5d89325b6b5911df SHA-1: 41bafcf3235cc8d2aeaf3e182da167fddfe6b2a5 SHA-256: e6f7253d5e62d1245bb8d4ce0ca326b37a523259dc8f3dad97936b311a574517
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or attempts to phish users. The heuristics reveal a link farm hosted on compromised WordPress sites, suggesting the document's purpose is to redirect users to malicious content. No scripts were extracted, but the presence of multiple external links points towards a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://aedelsur.com/contenido/files/kafodaxowor.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/8390935f50fa3e811b4e89efd5c27944/zixenoriselijixulubu.pdf
    • https://buka.ru/sadm_files/baretapiguku.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771fca2b51c---xefajuxuxemeto.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/cbdec4e10c2003466d02024cd0d934a0/titosa.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607022dff03f6---28004602992.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/p1515s8kqsv6l6r33gflt5qeue/56342970402.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/77655e8bf70f8aec43213beaf000ca17/rafudurelezopanaxetesitap.pdf
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/99a111d07a0079c0e9c6398afd462d07/58623350628.pdf
    • https://myclubowners.com/userfiles/files/45079441531.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160ae420b9e11b---bimazimosipade.pdf
    • http://mikllc.mn/uploads/files/bedon.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8qr6aq3fmrr8r4s1p4q51301n3/82945945511.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5fe63f4e4---gegulepofanuxezusane.pdf
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/20157350610.pdf
    • https://fsbulletsandbrass.com/userfiles/files/samulow.pdf
    • https://jdrum-music.com/uploads/ckfiles/files/31185049881.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc7959ed18a---letobeminodarok.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/d9cdf6fbabe69255f2fde1738221d1ab/32223657876.pdf
    • http://nuestratierrapremios.com/campannas/file/ruvafu.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0de139df92---47054478186.pdf
    • http://gibisch.biz/files/files/bagopiremiwuretulan.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/e68f30897b0461b7df2c7a4f71cf4174/22942011249.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607789729a09f---59261190714.pdf
    • http://obasekiestates.com/UserFiles/file/59191064396.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/59hs0jtdisfiobuvch8qb3nu46/medimawut.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/d2144423405be9b86d69bb90cc099db2/18302351420.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=human+body+conducts+electricity
    • 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_off0000dcf9.bin
ea0e8454c1b19175473689ce800ec92406feead160f4f1624085340c4c40325c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF9 16304 bytes
font_01_sfnt_off0001074c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1074C 16792 bytes
font_02_sfnt_off00011f63.bin
380b336c3f85d117743ea76ae321a0360aa5be6bbc66eaadd2f14dae744b61c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F63 10876 bytes

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