Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcbf926ab020b9ec…

MALICIOUS

PDF

93.3 KB Created: 2021-09-07 15:45:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c6212c6e50e393ebeb45c6f64f544c77 SHA-1: 96d5b4850cb38726f0e76b03d632e588f734eddf SHA-256: dcbf926ab020b9ecf39ad4b2afae48f16a2a53fb6774f9190c70e6902ca2b7cc
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to distribute malicious content or phish users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly supports its malicious nature. The primary attack pattern involves directing users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://infrive.ru/uplcv?utm_term=longman+new+real+toeic+listening+pdf PDF link annotation
    • http://hornets88.com/clients/56662/File/92270471710.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/7505727600.pdfIn PDF document text
    • https://sealskinz.ru/files/file/55714300216.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717574a1f1a---dopej.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/d0acfcf5678775143fc834f48a2abeb7/fetusoxulumesa.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/99429891172.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/diwawatujozidive.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/28012330493.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/oqacus9rlvnh4ssf83h18q7ck5/68436972540.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/4923195de567950004f00a2cee8304f2/95704433171.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16078303b4d529---23726371812.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/ab3c857de7a546b3969dfe16cb49c222/ledoxoxujukejuvizejaj.pdfIn PDF document text
    • http://airsoft1.ro/files/file/mixepisijali.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/ratepepirokiragudexefizip.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/nureripebupawafodujubaza.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7ccd58db7---ripazo.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dcc9965f91d---60617705809.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/varutepekawu.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/03d62c06358030fbc15e4db07bffd8d0/laputunowejuvinonisijo.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/bajixevatub.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/t5vpp7tseoings8u5li75bagb3/bexajog.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/65862992941.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/3e4c1da461937b397d40f3f78926baa3/kasumedavovewovupevarux.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB4 16548 bytes
SHA-256: 18db3a1ea444e9291bb0c6ab61b9094047c62aba0f5ddf6ce88af9d74ca848dc
font_01_sfnt_off0000f2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F0 25400 bytes
SHA-256: bd64a625e25765cfff146d72eff541c1c5f64227a612bbe774419fd4ddf4779b
font_02_sfnt_off000133a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014bb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BB8 11004 bytes
SHA-256: 145302fc5f312161e90e640d3d2ad0289ef998850a2ccaa1052ba6d4d6de8b8b

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