Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6e9e681eb7d7643…

MALICIOUS

PDF

81.4 KB Created: 2021-06-11 12:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: a6d606aa0f0831827e80441c9b34bb48 SHA-1: 0e1b19210537d778fa9d71e92ce661055fef6df9 SHA-256: d6e9e681eb7d76431680747a93afcd1541df1b4e2a7f95ad6a8512da0b5d663d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=mogi+khele+pubg PDF link annotation
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/kir7b80aju6gv8im5ef12cm3k0/48999358243.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd00f65e84---44217646686.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9a4de9434---sigemilogajik.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eef682f08e---22597385190.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/6d2b304dc76d9b1bf74bf3bca64b9ca2/novemumusudil.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/8n3qhtuaabim3trrnd6b1svhk0/rawepaxoxawojaf.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/23464332679.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/4c46kkiv8ihlqvg63mjpbtrt35/81414899583.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/22761450588.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/t7ukar0lh8if580jdo4t2fg0q2/6313663086.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bae1fd672f3---munalotarodiriludebed.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/cc6895cd4ce792a1762cf99c97766275/48474735894.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/171084068660afd4b54262f.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/96843064597.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/39011879304.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/734f4a2bc1031996bb59af7486b28b43/26648247393.pdfIn PDF document text
    • https://bamor.org/userfiles/file/12603271509.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/2e7971e2d013466e215f8816695b642b/fewexomuzawuwif.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/59941592871.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedorahosted.org/lohitIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB69 4500 bytes
SHA-256: 2f8a049fcf52ea56563ab55436d5c72425ac378ecf5be7f8d1d35551b4c72cb9
font_01_sfnt_off0000eac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC1 10856 bytes
SHA-256: ee148e4b98eafe704aac0110b0ab4789d9f46d687ea5dce0a12a239f3e2a4119
font_02_sfnt_off00010fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBE 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
font_03_sfnt_off00011dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBF 7372 bytes
SHA-256: 4b72e455199a5a681841731252565e231f8d88136982ee4dc0b6ae20766cc20f

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