Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c6db0275f03c7f4…

MALICIOUS

PDF

94.1 KB Created: 2021-07-18 19:31:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b8ed039907c1e974eb3599ef8866bf7c SHA-1: fcd69a4fea6df9f4a327de2bd39c5201bd7d1828 SHA-256: 7c6db0275f03c7f43e776c4333faebcf2fae210ec7df0a21359c0fe082614dc2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves luring users to external sites via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e423c5b83---lajiwakefego.pdf In PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607992054c6e9---12384516574.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/95271605018.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d03bd6985e---fakalanaxapawupakewinog.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/85122519184.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/ecirt8eu1kbc7fg96ch8irskhn/135559279.pdfIn PDF document text
    • https://motiv8workout.com/up/files/talutodil.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/44055034669.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/4727ac4a8061695abce016e8358915f3/26311202732.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/depazerekasozu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160886d5a2a976---87743892928.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/ba0bfa0a86f23e937a8cfe475c24831b/63632714421.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855148704da---jabepinolefibamugezudiked.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/02d5701e40a715b98f3d79d76f5b93ac/60845158397.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9626e45ce---90521624451.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/f2a1c2bea508ba53b05888c890a03405/rawebub.pdfIn PDF document text
    • http://prattsofdouds.com/clients/d/d8/d85aab9f4bcbae69c8358f7a9990a0b1/File/vojazoni.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/76376702e9878e36fba0ae06da278856/tivevaduvarigiwububu.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/munepifedafatopurafodi.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/gi1727k5n918b15rpddropnmma/36889537379.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cc70ad9bc---75315362766.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/rafodunizawokeg.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/kagusibugokufutatokamexaw.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/72bf1b57c2f44585a70234324b54f1c1/winebepikikarunolof.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f2a400412---1132233089.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=alliteration+in+the+seafarerPDF link annotation
    • 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_off00010e49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E49 18612 bytes
SHA-256: 18722a35f8e2dcfc7a24ccfe18a3525bf8c87a3ee1fb1a5498fef7e6ec4ea0d0
font_01_sfnt_off00013c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15437 10292 bytes
SHA-256: ae5076ba73dd719b991eca61c2ea73f0052a2ee2b8f4f11d62c50e006bbdb747