Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fa150d590d391b3…

MALICIOUS

PDF

80.0 KB Created: 2021-08-21 04:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e1a63a29d6f6425f4f76410b372aa583 SHA-1: 30a39ad0a234c4fc6349f14021ab8a8905ae8fdb SHA-256: 5fa150d590d391b37e5d8034944f392c880d225787c8fe6e5da5f976f6b015a3
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, multiple heuristics indicate the presence of a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8120

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://biroestarsa.hu/uploads/file/juzewis.pdf In PDF document text
    • https://soechi.com/userfiles/file/bipuf.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/74190010004.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/64137440934.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/78cbbfa2205d3d6524d43b0fbd9ac577/mipikizotexivim.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/39184874356.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/tuseka.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/68126111817.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080300978938---vozeba.pdfIn PDF document text
    • http://synphabase.ch/upload/file/50316131485.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/xumanox.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/2753608636.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/4b764e65993b26ff6a2e652fff5d3274/jeberav.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/fulopuk.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b232671c8---56114772629.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc7d27e872---koxaxonejivebadedakedoli.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/14f7e40e991cd6ad23b297c026029d82/11280618201.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/54561333715.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/zekile.pdfIn PDF document text
    • http://flightshop.jp/images/blog//file/18386912206.pdfIn PDF document text
    • http://www.alrafeef.com/faisaliya/js/ckfinder/userfiles/files/pibakikikane.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/62260428504.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e7aa00aeda7---43593671701.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/34182619631.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=nutrition+facts+dunkin+donuts+egg+white+wake+up+wrapPDF link annotation
    • https://mediaget.com/userfiles/files/fupapiguzikobupasegi.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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