Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2d3c1438c19d9fc…

MALICIOUS

PDF

97.6 KB Created: 2021-06-19 09:27:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 549cf973c70fb989f0cd753d09943663 SHA-1: 6c3de954193a0663947d10407d9ab338b455cce4 SHA-256: a2d3c1438c19d9fc79b2cd6af0df3537710f24f7158a00bfda8177ffcd75690b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely to host phishing pages or further malware. The document body is heavily obfuscated and contains no discernible user-facing content, suggesting its primary purpose is to redirect users to malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cf9d255a7---tupawuwire.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e04ae116a8---jipagemotudavitowivuzevag.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1a4d86f07---77723689587.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/4d19e7f19c3515f3a90cbd08fd878e17/54169203884.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160862ff0540eb---57567081747.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/43757497685.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/ba125853381b70f2e1a48eae5943f408/91741381771.pdfIn PDF document text
    • http://evola.it/userfiles/files/senezakolujupar.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/073a01n3hin8rma96p89i66etv/37931567394.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210606153538.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4cb0043ca---wigolewumuzalakigolu.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/1cf7cbea04660bc0e9c57a9e872155cb/21314315018.pdfIn PDF document text
    • http://desagresbrts.com/clients/34568/File/58178946854.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d52736af2---ruxedezijokasufomugolo.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/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=renai+circulation+midiPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C4 20800 bytes
SHA-256: 27391d88071bda3acd503059e234b0473e45c906b7702a79aa65e3215429ee4d
font_01_sfnt_off000137b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137B9 4916 bytes
SHA-256: a5686ac552eb6e0f6ff27dfbe81a33fdeaf4c56f3e35382ea782ccc890c7dbb5
font_02_sfnt_off0001485a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1485A 17656 bytes
SHA-256: 83ad8ee2921061b5ca8a8501fdc8cf3b727a1fad0929ca5e473cfed1addc7760