Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b1f8ea98147a143…

MALICIOUS

PDF

81.7 KB Created: 2021-08-23 21:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0399812b052fd6d924b85eb32b4d4576 SHA-1: 63332b9ee05d5f7f3ccc9428e142e3085170f0ca SHA-256: 0b1f8ea98147a143b8a8a2bee1e87268f9e37d8f02f99f69f66d652cfa692690
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised or disposable hosting domains, suggesting an attempt to distribute malicious content or conduct phishing. The presence of external URIs and the nature of the link farm heuristic strongly suggest the document's purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b0e083d33f0---fatote.pdf In PDF document text
    • http://xahuaheng.cn/userfiles/file/tisuvixirami.pdfIn PDF document text
    • http://bociany.sk/media/file/bivosanotofexaretepav.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/lajukadomar.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/jl9i2nbl6bgbv0nrf4rukpeok4/85248386299.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/7015d0d034297adbc89375c2956b18e6/kofapukozilujexesup.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/53603946623.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/9sundugpkhet8m7bvupndtl3ji/58213589346.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5dad7912f5---95867077845.pdfIn PDF document text
    • https://ancoraeducacion.com/images/sujizalodavalik.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103459695184---kawexabixekolufa.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/80194915152.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/bizesuvamejibem.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2f6664d4b---83788040007.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/568441311.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/73451979059.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607536f3329cc---44626724298.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pusosariseg.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/jaxuwarunatok.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84848833909.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/sidakapaxikotikiluxoxa.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/peronunafagelegoko.pdfIn PDF document text
    • https://gestionarival.com/userfiles/file/87073340736.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c07c7d161e4---74410110385.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/83400727523.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=inductive+and+abductive+reasoningPDF 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_off0000dcd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E4 16856 bytes
SHA-256: 8adf18d6b8305987bf3c1fd0218c3d6f21a1244655c879a1a31104849508e76d
font_02_sfnt_off000120bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BD 10756 bytes
SHA-256: 487d7336bc40a58948115c698b664fcad027635c818d9fbca124249f0872a23f

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