Malicious PDF — malware analysis report

Static analysis result for SHA-256 db431f29f2c76424…

MALICIOUS

PDF

83.1 KB Created: 2021-06-17 19:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 2cde4ca490435744d2c7c77c5ad68c0f SHA-1: 5dd51cb42f89c9650cca7dbf2c34e689509f3299 SHA-256: db431f29f2c764247fd783a83449fb7580d480f9b2b4c06330ed9049b28ad1c9
176 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to host and distribute second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://willmarlakesarea2040.com/ckfinder/userfiles/files/weputiromubawugowixox.pdf In PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab2e9a95e8---22551166302.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be80a90f73f---13578534318.pdfPDF link annotation
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a09a0bbc4ed---moxipelewiritebijigow.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210520001207.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/buhr9v518ubgbrhqe107aolpr2/jojudaratazoruf.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9dc947dcf---16984917817.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/10302230126.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/gokigafazaluzoxuliwelalum.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/d6b471663d1d1f8786ba3d9946b2b6b9/84466331637.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/wekexapa.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pipebimegiroxadomepabo.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/zozatejazarasil.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/05fcee572ed091abb60e998f033ad325/febidadakovojufekugeseret.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/40441665194.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/sejidonazivovumepozo.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608356d93bac8---detarizezudaxalu.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a632bd4dabf---47270313352.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a86fca120ee---perovu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=appleton+farms+ham+instructionsPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/fizisitaletegikap.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10167 5244 bytes
SHA-256: eb0da360466ee4a0708cc6bf56b95ea5f5611c2a5c459a3be409bf1a83f67343
font_01_sfnt_off00011310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11310 12680 bytes
SHA-256: fffa21489804bc04816af6331c993d67b37ffdca8e468961dbbd157c69d4129a

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