Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd6a7f5c6dcdb1b9…

MALICIOUS

PDF

77.8 KB Created: 2021-09-02 17:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a3ea026199f381140ad270ec6852168f SHA-1: 8709cbf7a9f9566dbb86d1286037362ee6eb021c SHA-256: dd6a7f5c6dcdb1b959a808ac4c1be7245130177c97c91b317f1a006ae42a5765
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm on disposable hosting designed to attract traffic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=english+ability+test+telkom+pdf PDF link annotation
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce42875c45---korusovufug.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/90286806141.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/xizasubevodate.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/23888153527.pdfIn PDF document text
    • http://bipaf.org/2009_home/upload/editor/file/fibubevogusaparixutabal.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/66762616434.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/talinoxojubukufigekosa.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/tuvuk.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/5639e16180e18507f779bf6cf8a2cf23/molevupupaj.pdfIn PDF document text
    • http://martonelektro.hu/files/file/18072998029.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/tuzaf.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/lebozu.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/sewenedola.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a67551c3eee---nimafafojoro.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/pubibixe.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9251648ce---vofagilaxog.pdfIn PDF document text
    • http://topp.pl/_topp/file/35784441872.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/sulikodisuvokufa.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/gegop.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/mojirarugosowugupol.pdfIn PDF document text
    • http://daikinhbac.com/upload/files/notuwizekimiguxarozajikim.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/36537620152.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/9343151958.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/wugeniribisanosutam.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/qvbpf5k8a22hg6tav2ov0dtqss/lomenumibumo.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_off0000cc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC16 11176 bytes
SHA-256: 19cbaf39e0e90d496291332773d5f580a3a04a164f0960b178786c47d5fa2398
font_01_sfnt_off0000e598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE598 16776 bytes
SHA-256: d5a34dcb6a2c4b447a9c19331db62cdfa6d2d6e61afd5b6e168671608ba4a322
font_02_sfnt_off0001115b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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