Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd9bfe5fc0ac0f3…

MALICIOUS

PDF

85.4 KB Created: 2021-09-01 18:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9b56e003f5b9ab9fe065d88ecfe2b152 SHA-1: d3466ff8284f17c8cb59f9798c93cdafd504a0f1 SHA-256: efd9bfe5fc0ac0f37683ce215850ae3e7aead3d9b4f885c7d5411abaf7501236
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting domains. The primary purpose appears to be directing users to external, potentially malicious content, which is a common tactic for phishing and malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://queure.ru/uplcv?utm_term=family+and+friends+class+book+pdf PDF link annotation
    • http://northwestpixie-bobs.com/clients/e/e1/e1941a3904c49320334fd90e0ed9e852/File/rifumakabaj.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/31912957404.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/75094637087.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103cf4ed17a7---73790958856.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/72993801093.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/2cf82f1b9e3dd56c16d796d8ef36870f/31754403170.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/dq05cg65dpgvi1ct5naoo3hfq4/23920460093.pdfIn PDF document text
    • http://lyshiying.com/d/files/36886357928.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/667b3988b947ffd7116ced6eff8145fb/sumozaxarozilo.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/bedogunu.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/71553230194.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/44a7f43a371ea79406cd419a0b128cd3/76527393346.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec9d132da7---govodaniz.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e0008bee8f---98951892512.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/48982688980.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/k0irk070n3oao0cb3j1o1qpa1i/zezimuvasevenuvipegiz.pdfIn PDF document text
    • http://ramz-alqassim.com/Files/files/gavog.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c6580bfde---fogumegowewifapemideton.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210812174525.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e34651ac23d---40923658367.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/juwalanotised.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_off0000e7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A7 18028 bytes
SHA-256: d1e1fb66a79a993ea0f533fca6815802c87340af8be736eba66de02ecc9ee995
font_01_sfnt_off00011630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11630 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E47 11004 bytes
SHA-256: c91014dc29b966712798714a86f6dfde710420b4edd3ccc02fb11f60baaf72ce

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