Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbf1b08264bc2f4e…

MALICIOUS

PDF

89.7 KB Created: 2021-09-01 16:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 442c6913795b32d54fef9e711cac37bd SHA-1: fb325fbbdbe6a76473e66e21da77f631e9b24b71 SHA-256: dbf1b08264bc2f4eaabc8fed391c74ac24338dbf7f080f006d6b912d7ec75706
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings indicates a pattern of using such documents to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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.kotolantopeni.cz/files/dasumiridodamemoketixeses.pdf In PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160994e7470c84---79537245299.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/65015877857.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16095e4a9c4833---raxunopapakexanat.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/patikilijim.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/wagoran.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/86222757903.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606d492c47caa---37701629503.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///49463594329.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104f1ffdce41---nawubavu.pdfIn PDF document text
    • https://premium-house.uz/images/file/sulanetuzazenero.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/968996a4d6028773fc319a34423b6a12/1441000180.pdfIn PDF document text
    • http://nctpa.biz/clients/5/51/51e593b678cc4707ea5ff7b662bcbdb9/File/sakabitunuzax.pdfIn PDF document text
    • https://ikansambel.com/contents//files/nepifuxadolup.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/67532025213.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/24447193774.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/f8d77422b97f87cc196bef7b987196dc/zikip.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/vubamidaxuboxixasa.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/4c8b099449a5c2ba6adf8d351294dcdb/77952070251.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e7fbc741e---zovurawoze.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/nojogubaraxini.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/df50b376ea1e97e5704f42d4cadbaf90/9919048511.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/6atkjnij5deooc71ah3reauft1/punatu.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/52511204680.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/37063305824.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=another+word+for+symbolicPDF 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_off0000f6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A4 18544 bytes
SHA-256: 5fb0e8c934a7a63a1edc92a0604c8dd5b2e04fff1ee5d322710f8821c05f4c44
font_01_sfnt_off000126a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A8 10900 bytes
SHA-256: 54c259ee28cc86f33ab54024af4cfbe6f1f2b52257909c5d005669c10756a634
font_02_sfnt_off00013fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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