Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8ab2c2a5a50b7fd…

MALICIOUS

PDF

82.5 KB Created: 2021-09-05 18:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b448a71c0406d4fa41bd5d3bdab1fe6f SHA-1: 93d2f9038b692bf8895786d10cb9b677afdaba6a SHA-256: e8ab2c2a5a50b7fd7e7d1ed52c50ef57ec960dca03f99cbfa8a18cb0583dd44f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are hosted on compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the presence of multiple external links and the overall structure point towards a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=corso+italiano+per+stranieri+pdf PDF link annotation
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805abd05f75---guxugemisurosajigizix.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/lidelofowarosodukukopo.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/43516772189.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/37305268478.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/60738466338.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/ed9e372e0e04ee3af41fce9f9af528ef/50676995249.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/fevumipu.pdfIn PDF document text
    • https://premiersuli.hu/files/files/vijijilewuxemelananuz.pdfIn PDF document text
    • http://timocomputer.cz/files/file/5955131065.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/1ab6d33cf704d65671b0a1184e8d9c35/biduferijewariromuvewipag.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5fa75ce409---valojanefevulez.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089292731396---42418758077.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/s6rrop7h7tsg5ifgs9lg638ph3/44021348714.pdfIn PDF document text
    • https://pmms-online.com/assets/file/sobewijezaxesitikipe.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/t1ggk3j3rq366f67rkg2al7pcf/73014008643.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3117907d34a5ea7baa3a3c92ed0364ea/20258061181.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16087057d99a8f---40084610084.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b457a29967f---vawinibosaxidaga.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835623d5f3d---56159325633.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/38502460668.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/d0ujuq8ue3d39vvfp1n845p1j3/kaduxewuwirabubivijuji.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/memubagazekugewisakuke.pdfIn PDF document text
    • http://zuche0551.com/upload/file/52533641178.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/nrlmjhlju2ehir2eiv3i13d24o/dunofepubemelupuva.pdfIn PDF document text
    • http://tfforming.ru/d/files/77366337036.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BE 10520 bytes
SHA-256: 3ab24ed6d54748ab507e65596faf7c4bb793d1659d1f90807086d5d3d2a519a0
font_02_sfnt_off00010ccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCB 17936 bytes
SHA-256: 0976515625e87235b7a15433189b2f3198158e44191fef0aa6fbd967ce8c4ecd

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