Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eb0a32d3f935ea8…

MALICIOUS

PDF

94.4 KB Created: 2021-06-14 23:14:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 786cb0db1f0e8e8e8f82a3d2ff9abef8 SHA-1: 4601e57f6736ae1c36bcd868b1817489f136740c SHA-256: 6eb0a32d3f935ea849459c1fe8ba3d3a831aa9616805258522a04d8b73e1bfa2
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The document body contains obfuscated text and metadata suggesting it was generated by wkhtmltopdf, but no direct scripting was extracted to explain the malicious behavior beyond the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://huntic.ru/uplcv?utm_term=code+for+soda+popinski PDF link annotation
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d6298e32d---43094199118.pdfIn PDF document text
    • http://tremonttemplemacon.com/clients/862779/File/pipijimasosekefomovukata.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/67447136277.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/29958145271.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/pujukalulonu.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/6vv3ei9uij295k5j6btks1n1o4/52485753399.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/19293411414.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/76420403291b806894b74a8a5e22c5b2/susebixuxefanurasuvujet.pdfIn PDF document text
    • https://soechi.id/userfiles/file/jivitamapi.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160ae22cbd3e5b---37907725406.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fef4f494ed---fawilimepidoxexoxol.pdfIn PDF document text
    • http://sxhk365.com/uploads/file/%5C/91020503163.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071772f7e2e0---dojaxiwaligoro.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c49922aa76d---6582673385.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ba413a979ab---83469497337.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000115eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EB 5980 bytes
SHA-256: af769addef880bff912b3f61533f74804888a5f21efd10b6f241e355fb0eda67
font_01_sfnt_off00012a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A56 4972 bytes
SHA-256: ecdc519d7a3c2983e3bb2a4b64279e248df6409dc86603e16eacaa10f71dfb7b
font_02_sfnt_off00013b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B4F 16104 bytes
SHA-256: 000e2cb3d9b5f5b9e7fdbe5c92bd44bfc70a9f1d370f6a99279ea7e77508f23d