Malicious PDF — malware analysis report

Static analysis result for SHA-256 78cfc460ea05ba2e…

MALICIOUS

PDF

80.0 KB Created: 2021-09-06 05:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dcef6497189d2cd464b30d9cc80cba56 SHA-1: afdfa2a9a666e88e6c1402a47210a7bb098af71e SHA-256: 78cfc460ea05ba2ee2b08c37eaf94107e34d45954d8fe5e587dd79b30ce6f937
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, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The presence of these links and the overall structure indicate an attempt to redirect users to potentially harmful external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/d9e5c60890384ecb95eb830e1a84132a/rekaposulozigadekidu.pdf In PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/67069164627.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/sadidiluvuxevadox.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/99898673798.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/74898336902.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/akj5o8qu3pm461tbpa0hu6rd15/22994347465.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/o0j899c4sc1kpriosi94s53363/82732389346.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/zaxasetalosigarevuvanas.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c741456f1---82155925835.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/bc2ee0b8d81e411cb70a3972382189f2/46225936501.pdfIn PDF document text
    • https://seitonsolutions.com/ci/files/34655460629.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/rodegupipopamodadezuv.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/4d1585b50f998386b630aa9e5e521b27/82516608899.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/dagajaberinitobuso.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/a3ff8101f60aa3947516ee0083f36c55/gidejipit.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/86386932157.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/73049874220.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/jobufuluja.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/451f1f18842ac8d397e342260b0fce8a/97452363452.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/70824896530.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/soxenebolowaxigerorose.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611a4daf97fcd---51408093525.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/78450924363.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=insanity+asylum+fit+test+pdfPDF 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_off0000d52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52B 10604 bytes
SHA-256: 86765f1b4a132916403f0ee4fe78d849dab6454002b4b7e96eed3196adfa6e19
font_01_sfnt_off0000ed69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001057b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057B 17364 bytes
SHA-256: 66c7d680a78fef424c11056133fbc35ac67176c3f9f359d0f461cef922c74ed6

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