Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6ca28ce5c08fb64…

MALICIOUS

PDF

82.6 KB Created: 2021-09-18 07:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 193e783c2ae791ec19a03fb416eda31c SHA-1: ea8625b4363afcb7e5811018ffbea37a85619d6e SHA-256: f6ca28ce5c08fb642aff7505ff9f9b9cc1f1764e72b57240e786803613911fca
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a social engineering lure, instructing the user to install a browser extension or update, which is a common method for malware delivery. The document also contains numerous links to external websites, some of which are hosted on compromised WordPress sites, suggesting it is part of a phishing or malware distribution campaign. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://infrive.ru/uplcv?utm_term=how+to+set+device+name+in+android PDF link annotation
    • http://nyitotthaz.hu/userfiles/files/3222626508.pdfIn PDF document text
    • http://slr-eyewear.com/slr/userfiles/20210918094906.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/jatojidebulewowonezugeta.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/16860477506.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/gefofobexefuzux.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210917093740.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/55741894081.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/7e48831ee91374f068af4c1576fc7076/lazozuxitanusekinu.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/1326000105.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/jukowajedexutadovu.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/34907259593.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/kakilit.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/7d17e3a5d35c0f44024cf5326ccc50d9/savelivif.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/rokironi.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/70831045302.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/0e312a862e4220d26d0a2bd95c1ccfdd/85806754373.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/69973737830.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/mekekufifofaze.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/modenikawumowunewot.pdfIn PDF document text
    • https://eetravel.net/file/25262546587.pdfIn PDF document text
    • http://chargooshads.com/images/upload/files/31430904547.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/novisesepujumabaxivorogi.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/jawetevefakuniligaxo.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/57963090029.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/70637062354.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_off0000db88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB88 18820 bytes
SHA-256: ba59c268777eba1dd35131061061652d5adbe8ea205d2d808e8086cc0e694170
font_01_sfnt_off00010c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C28 10628 bytes
SHA-256: 4db6eff00e3158e764fb9f06850621fd1997306922589566faf5f33706b0eefa
font_02_sfnt_off00012480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12480 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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