Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb7bee271e0de036…

MALICIOUS

PDF

74.9 KB Created: 2021-09-02 15:29:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9bd1f6fc767766101a7034905a8acfa6 SHA-1: b99818df61402382128ae9e7734a446792a24231 SHA-256: cb7bee271e0de03678abee1625f187d3200abf3d4be49dc7a67ea9b2bb4a03e2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to potentially malicious destinations. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high confidence score further support its malicious nature. The file's structure and URL patterns suggest it's used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/d98153b5b1641c83cda0a29aff3080f5/rivufudowunidafamow.pdf In PDF document text
    • http://j1medical.com/uploaded/file/xiruvaneraw.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075edc6a66d6---49932517949.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/52223164644.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/ll53d4pbtvvkh9llijn52bm9c6/94056155171.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16125b1ea564bd---buranuna.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1c70802f7---40887776252.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/4fffdf58e07d0f0a692e80f7c9fbfff0/vudotujomixedujuvu.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16099c96b69a91---gepofu.pdfIn PDF document text
    • https://ikima.fr/uploads/file/lijunobutizitegaxakex.pdfIn PDF document text
    • https://kueapem.com/contents//files/73243902713.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/88b86289a3a059124a144d6cc7b8c352/75719629594.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/nivodakigeta.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/0c061c65ebf7856ae8aa37e014d76450/49648329904.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/96331890027.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/0pciunsjgvspkkc0gb17h1roeb/23751644487.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/at9h5467j5eegehfc4ft3494h7/31439386635.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/11208966845.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f96c6957474---5120283689.pdfIn PDF document text
    • https://langumeistras.lt/i/File/nifidibebe.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/311851432177.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/01474143efef9c507a5efd03eb12c547/80722927692.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2b9a3af895106756b929b63d71d5746b/83578902121.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/suwasakatugowowizoza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=hibernate+tutorial+for+beginners+with+examples+in+eclipse+pdfPDF 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_off0000bf97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF97 11484 bytes
SHA-256: 9f31aa4d56ce76481bbdac39d76fabd3abb12487636f2cc6d6b30d167f5d38e7
font_01_sfnt_off0000da2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2D 16860 bytes
SHA-256: bf6a72e63f4902c880f5566cf2ed2d110f684896a1084cbb08d35071a917d191
font_02_sfnt_off000105ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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