Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c3d7d6d888b6797…

MALICIOUS

PDF

69.7 KB Created: 2021-09-27 20:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d2fd81ce65cad42fa48cb879120dce67 SHA-1: 4d7e07c73d87aa373c190fb9b3c19530c51ef45b SHA-256: 2c3d7d6d888b6797444234f548f72debb69fcfd7eb315641916a05d2dcb449c2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, including an image-only design and embedded links pointing to external websites. Heuristics indicate it's a link farm on disposable hosting, likely intended to redirect users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly suggest malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://wastran.ru/uplcv?utm_term=fundamentals+of+dimensional+metrology+answer+key+pdf
    • https://xebecdesign.com/xebec/userfiles/file/zijefefi.pdf
    • https://cakesandcupcakes.net/userfiles/files/11662345935.pdf
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30594484696.pdf
    • https://mandarinusa.com/userfiles/file/1632445084.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfa8fae08b---kerinitufez.pdf
    • https://aimhc.com/userfiles/file/36807214499.pdf
    • https://alident.centralcms.cloud/galeria/files/44376425419.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b16c906276---moserozopumugo.pdf
    • http://anabakorea.jp/userfiles/file/64737237961.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16151a19d3c50f---31247869470.pdf
    • http://zussobrance.sk/grafika/dokumenty/wadakuwerovitosedowawug.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/bf738304f2d86f45a062793b97edee5d/lafewubok.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5a3b1e84a---sarazopafutiguwanuw.pdf
    • https://theipbuzz.com/images/file/tafiwitupaxejiveresanidi.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/d0be09521f9a6f342eaa971e29f32fd9/88130064532.pdf
    • http://xz-brand.com/ckfinder/userfiles/files/fanagifujeloj.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9a770213c---81305541010.pdf
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/47309057285.pdf
    • https://ukmalayalamnews.com/userfiles/file/48224389106.pdf
    • https://fullgame.hu/uploads/files/nakasefitaxeva.pdf
    • https://corpus.bg/files/fck/file/11554601269.pdf
    • http://www.saletime.gr/admin/fckfiles/file/67587675644.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/ce4a3dbbfc5a0fd65b15bd1ac71a8674/72850203681.pdf
    • http://ilsogno-bomboniere.com/userfiles/files/xudapewelalekenesimodo.pdf
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/satenabigikaxufosu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b44b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB44B 16792 bytes
font_01_sfnt_off0000cc62.bin
ea0c2d92e9249f4b25b108623117f57b4663b3c287d1ce9734ebd9239f0006d7
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC62 11208 bytes
font_02_sfnt_off0000e672.bin
38b8b25177e259fac8526e878b4659b05594fe35dcf3f9dd4ef7d1c31cd1d7cc
pdf-font-stream PDF embedded font (sfnt) at offset 0xE672 13664 bytes