Malicious PDF — malware analysis report

Static analysis result for SHA-256 89dc2f2882e4f6ed…

MALICIOUS

PDF

88.7 KB Created: 2021-06-26 13:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6c41713852e758a94678e6ba624540a3 SHA-1: b48534b1583e29138f32e3c4700cd2b0b5a8aa33 SHA-256: 89dc2f2882e4f6ed39718fa92f4e45ff6625037cf2c12db5e3b73796fe348d81
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its true purpose.

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 https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7e5e54be2---ridusofafefunumom.pdf
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/8473153d57b6317d69990aeb883b1f78/fekadavuj.pdf
    • https://adasms.fr/userfiles/file/wavuzepus.pdf
    • http://ackerviewguesthouse.com/userfiles/file/zezezebeg.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c308610b62b---33857562416.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/c3757u7uha7rr8k8ifk5g4mefi/fumexujakisikufini.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b4da495ea---runufovedulan.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/9e3663f40b59b8ed5922a568cfdcba86/volonobulimepuvid.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/fb93583c86844300222ae75d22305697/36358122352.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0ba579f9f---3909800683.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ddcc3508aa---kasamoxewesabixojat.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16073f16dc77f9---22523297676.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16084a0bce7757---39584996762.pdf
    • http://aeronautike.com/userfiles/file/sijivakixolevub.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/n1v6tqn3urq3ohlhtn66qj9qu1/warer.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/n3jt07bb8bbfjklvn0i467i5i1/89238856831.pdf
    • http://thaide.org/userfiles/file/vejitabuditikofe.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad46d51fdc8---21300086706.pdf
    • http://lumieretvie.com/userfiles/file/74382019434.pdf
    • http://capmar.eu/userfiles/file/72452102860.pdf
    • https://mehreganimaging.ir/images/upload/files/1434891032.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/a7202ac88974a5a8bd2e5698bbf87a09/sitibopivemugikuxugeb.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093dbd37934e---rekujolajejad.pdf
    • http://espacioschillout.es/images/admin/file/vezagesedonepakuporozuxe.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=if+both+parents+have+positive+blood+type+can+baby+have+negative
    • 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_off0000f72b.bin
8dc625095bc516b50139c9072ebab5ef4e3cd871cdd3ac80d582af77caf29a37		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF72B 16892 bytes
font_01_sfnt_off00012324.bin
2acb5ac6c39f5c30eb211a825a53e71362111517f36783f312b030ed1919bf6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12324 11168 bytes
font_02_sfnt_off00013cc6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC6 16792 bytes

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