Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b5af82e4f73cf4d…

MALICIOUS

PDF

81.5 KB Created: 2021-08-28 17:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f80acb740841966c4a6e7835ae6def0d SHA-1: fcd64a9bafb0d916f5ade0a0ce1e54d9af310b36 SHA-256: 7b5af82e4f73cf4dd88b37d20e56a6c6e70291295f04284fbc439dd929998b94
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, employing a link farm strategy across multiple compromised websites and disposable domains to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload or lead users to a phishing site. No scripts were extracted, but the PDF structure and embedded URLs suggest a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://garglob.ru/uplcv?utm_term=vlookup+to+the+left PDF link annotation
    • http://kapelski.pl/userfiles/file/rowejumuvusuposomex.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/kahu1omb48vbj8rl9663e1i3t6/tekurepalitasetawa.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/da4bf9ba8bbf4e333284b63fdadc7dfd/tokapiriwala.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/42535697465.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/9d86bf33198a0c0704374eb52e066e76/97292636179.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/rapiz.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/funazebopumodetajixadosow.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/48d659646a820b0acbe32e468c49272d/56928178978.pdfIn PDF document text
    • http://cabin4kids.org/clients/0/05/050cd0fff5f75fdfd14851583cc0de74/File/9192541749.pdfIn PDF document text
    • https://nasroglobal.com/userfiles/file/zezaxezuvifamusevop.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/tegufimasopuginezasob.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/24880891057.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe1261d626---76860689507.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/3482886016.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/44e1825acb7a447088e9ecf0c8a0264d/kivufejuf.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4f579835a---79610244192.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/netemuzawuvuguxezo.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/76630761263.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/3ce9ecf9af312addbb98ab5a17105637/63294003475.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/78482557547.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607339de2807a---64415630452.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28830451001.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f864ddb63---93189774028.pdfIn PDF document text
    • 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_off0000d8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A6 19120 bytes
SHA-256: 5deae3a62a4950b6ac9dc007108886034b0e9719b063b3e8f10c6ad754ae0bab
font_01_sfnt_off000109fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12211 9992 bytes
SHA-256: 8dc632f321c7ee8131ca6c658ef36d431f6b032aa0f5a2bc9a658cab7056ec61

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