Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9dc5867cfeac721…

MALICIOUS

PDF

66.4 KB Created: 2021-05-26 17:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 577e0d30dfb4f0d69a687239ba470e71 SHA-1: f6b7fd2bc76275999f6351b3823f54493e04a891 SHA-256: a9dc5867cfeac721cc01bfa9ce98cd0a284a56bc6e1ebe6718544a4ca5fa7677
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://drafthe.ru/uplcv?utm_term=red+ball+4+volume+3+unblocked+games+66+at+school
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ac2707923---buzoberov.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2374b7b513---zixipidudo.pdf
    • https://cuisinescartier.ca/upload/editor/file/nerurubanisivurale.pdf
    • http://penzionklara.cz/userfiles/file/40311353619.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/d98dd2c493b3cae08b429d76db37f4e7/vifewatolepugusafetimesu.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/kj17s54fodclnlfeoiic4mt781/satuloninin.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607509a75c849---togekigipa.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/bpq4q5tt8vr2gv2q9vq69n5vk2/pifulozutadaxafuvodezapus.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076cfbb6e9ac---71594129480.pdf
    • http://opakowania-loga.pl/zdjecia/fotki/file/wuxigaxovirubuvodisuvuw.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc17c300b7---nonejaperib.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2543106026---teninadotirirelopesonup.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca95e2b020---punadoporojirok.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd21d6bd9f---lagazal.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/2be8c95b3b24dc16e26cabd85cb62d1b/26775273874.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://www.hoodamath.com
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c60c.bin
70260ef4a1fc449f25563a6e0f070e703d8de2246ad29b2cddd0477419fb2815		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC60C 5936 bytes
font_01_sfnt_off0000da33.bin
75f501671a3aaef33fa7307632b36e90aecb1bab36b339235c28c61da237791e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA33 10204 bytes

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