Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cc4e5c545d10201…

MALICIOUS

PDF

85.8 KB Created: 2021-09-13 15:35:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0f687647b8e3bd282a083ec1bac89aa1 SHA-1: 0dd5a2bc273dc12c51e6eacbd8b616b5ecc2d9d6 SHA-256: 2cc4e5c545d102013b5e670a38e9ed1a7b3300b73f55f202e52d97f636d9cad5
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a tactic to host malicious content or redirect users. The document body is unreadable, but the heuristics indicate a link farm designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfe10cc0a9---javepowadolozavakunol.pdf In PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/68999860799.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/nvtbnf9fusnpvig638s375a1fe/rapetal.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/25284324618.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/75931224045.pdfIn PDF document text
    • https://begili.com/uploads/image/files/wijevazibasodidebu.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/79060489540.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/wivudilujaparawuwofe.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/xowumogajimamutuzap.pdfIn PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/44854866189.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/wadikesil.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/duwanebilozovuzananejene.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/59080866419.pdfIn PDF document text
    • http://www.andreapondika.cz/file/48493640911.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/41430706166.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/lirodapimogevive.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/14894966806.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/9406494080.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/11032637804.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/kebozisusapifazataw.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161327659d89cd---91831993913.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/39282723679.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/81732081391.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/lewafa.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613f259244db4---92121946672.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/gobaremerubeguzazuwudewi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=cities+skylines+best+vanilla+mapPDF 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_off0000ea03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA03 10636 bytes
SHA-256: ada46c80f0ea7510edec7b7692f91d36cbb160500d838d8bcef865f19aada615
font_01_sfnt_off0001022c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3E 17672 bytes
SHA-256: f83354ea5904e6bb914a751b1021f4fd3a0e1f8212cc62107eef299a36caf2f1

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