Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a1c75b13794d729…

MALICIOUS

PDF

75.8 KB Created: 2021-06-20 15:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 3d519676c372312e302aae1b248107b7 SHA-1: f408b5e6cef843123b7e04a1e009cb1d3183c0f5 SHA-256: 9a1c75b13794d72925867c4ac3f48292c17ceaa0e69401cabf35588b8734f133
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF containing multiple links to external websites, many of which are hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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 http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f5f9c44a7---85902757474.pdf In PDF document text
    • https://alianzatours.com/imagenes/file/46430692692.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/73639115595.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/g4g2m0rck3cfuda9bgu2hk8b14/76636086191.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074122940f57---62655199842.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/0b45be2a67554ae6e2e22b4fd3fc5cfa/33095915886.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/74468328629.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/bugoden.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608bf17f21644---25600241184.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ghb7a88g6l6a2arkgckvoacdq1/55606988107.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/vekodubezodomusukinenojo.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608c60fdaef78---37644481474.pdfIn PDF document text
    • http://stpatricksreunion.org/clients/84553/File/giwanubebipo.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/26e955928924fb6d87bc21fb364c4812/96804300492.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=intersecting+secant+theoremPDF 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://scripts.sil.org/OFLIn 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_off0000c59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC59B 5116 bytes
SHA-256: 6d16159cede80165ef56a5f465635d3a23ee7c44cddef01934da1e4e3b970056
font_01_sfnt_off0000d6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D1 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off0000df5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5F 11840 bytes
SHA-256: ccbc546ce6854a2a200ed42cbfb03e40117d13f3d2bad4cdb7b39083c7fac757
font_03_sfnt_off000107f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F0 17472 bytes
SHA-256: 9b2e163b9597c09d1f9e9d681484ad23fb5e4b87b088c3778cd79adef494ca8e