Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2f4e290c71fa848…

MALICIOUS

PDF

71.7 KB Created: 2021-09-24 18:12:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6dfbe9c2b722473c33157e10b41c1fff SHA-1: 4767fdf2a3154baff835e8a9f59c007a294259f1 SHA-256: c2f4e290c71fa848f7de468109eb5b7e3a16e117eabb2004050ad2d19bc7c324
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://intekcanada.com/ckfinder/userfiles/files/95073837619.pdf In PDF document text
    • http://norrlandet.se/userfiles/file/62384522225.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/vufusulufom.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/tetudebenexegex.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/97328676151.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/45348262779.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63612445928.pdfIn PDF document text
    • https://vr-spagna-20.effievirtual.com/galeria/files/rurinewajod.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/30613600021.pdfIn PDF document text
    • http://htbestcomputer.com/media/ftp/file/98529417744.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/ccf66edb433d67e32cbc85a073a15bb2/19419913238.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/028td6r43qbpj8m4btb8te3fj1/nufonewosapamoredolujina.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/31353095590.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/xepinukasabamukim.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a060d3055---jowopaxuvizi.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/70028863061.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/gipulafuxube.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/nokebulevosesuzaka.pdfIn PDF document text
    • http://gzwep.com/img/file/202191920356.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16145461dc543a---39868816580.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/97238862485.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/68763916150.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/xidafupub.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134648ac22d2---71846524207.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=cars+2+the+video+game+apkPDF 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_off0000b486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB486 11000 bytes
SHA-256: 17ba6843437fa50cb1a784f167d53d3a54e95ca34ddba565790f004723c6e847
font_01_sfnt_off0000ce02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE614 16912 bytes
SHA-256: 295e063e395b2d2719db5517c11696167137820508a3565ed08266570b7d03bc

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