Malicious PDF — malware analysis report

Static analysis result for SHA-256 c72bbd1398f3a8ab…

MALICIOUS

PDF

75.3 KB Created: 2021-06-09 05:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: eab4bc4b00c96e367d5d0461eea1a261 SHA-1: 8955e8609840019e88eb161c0ed713b97914bfa5 SHA-256: c72bbd1398f3a8ab204265a7a3595d5b7259013fb9f16bcb99d0bf4ac9cccc58
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters indicates a potential phishing or SEO poisoning campaign. ClamAV and ML classifiers confirm the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://drafthe.ru/uplcv?utm_term=gba+emulator+paid+apk PDF link annotation
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/b631cd9a65db36f308bb79190a219be6/68381412069.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/9805d7280caabf84c33820c76251d622/51286581917.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/05vjpr0408rs5gfdfpbcqciu1i/wososifaporikobimipulemis.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bda52c99113---41806999636.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/89758614937.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/3844671094.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/52401745045.pdfIn PDF document text
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/balawaluwefiwisewebig.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2d85540b4---61680118348.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2f8995e4c---50363875631.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/989955dfec85a848b8f45de5c1b33d9d/ginaligedurefopesekekege.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/39083587123.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a9915af46---bavizimin.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/26436296956.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/pidodusideguxukege.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCE 4940 bytes
SHA-256: 4436cf76023c7e708a774696e7b1dc24ff28e86d95826f011e4a6d6fc8b80745
font_01_sfnt_off0000eda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA4 11224 bytes
SHA-256: fcb27eb97275007d2895591301bb08ff829d140ebaa4348789ba14d86638958a
font_02_sfnt_off0001123b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123B 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e