Malicious PDF — malware analysis report

Static analysis result for SHA-256 50cfa15559cf6f02…

MALICIOUS

PDF

89.8 KB Created: 2021-07-20 17:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0d4f726206d3ae644a161f0bd3a69225 SHA-1: 12a527fd7fa9f0c6d2f440bdfd816095d88bad27 SHA-256: 50cfa15559cf6f02981081656f54e4c96086735f11ce23c79f718232ec433fa9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm and contains a lure for clipboard command execution, suggesting an attempt to trick the user into running malicious commands. The presence of multiple URLs pointing to compromised CMS uploads and disposable hosting further supports a malicious intent, likely to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/domovanomozaritan.pdf In PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083b5628beb4---fotigokigewajefibe.pdfIn PDF document text
    • http://alexforstarlight.com/clients/4/41/4125d763bdae894b2c088b8c4c0f4705/File/6582368376.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/91599000446.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/a4a558a80e7fff6e001fe6fcf66ebb7e/sovitoxajuxuwexunot.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/79453446553.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/065258f0129f5fd14d8954d2cd46ea63/sotafatutulo.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fc899ba4c---35783152090.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3de21620c---30718125375.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/34863203129.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e9d4066b7---telekujanaxazojuxaz.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/labajodipawaj.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/6a18cfb8a2fc387e058e9d6229fe6d9d/9714970821.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fc12890a6---noxibamekadalorute.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/90755538754.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/kijinefajetonam.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/355a39f485109cc4060c551d68526743/29222301523.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d97676492---88718064931.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/2410031137.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/2233eca61bdbc26140011379ba063e06/49639766478.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/61322074333.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160741e4008ece---82667675803.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d94f6d309---41064979962.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160923faeeeeaf---64339589207.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=fast+and+furious+9+full+movie+download+torrentPDF 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_off0000fae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE6 17232 bytes
SHA-256: bf3e62a50f3a30443768d1601e3c9f864c9524489ed1626cfa296b361d1c099e
font_01_sfnt_off0001282b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14042 10912 bytes
SHA-256: 3f353f23e8a4b7c480ef15b033e55fd6b3491d9d2661b8ad774401f109c3f2bc

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