Malicious PDF — malware analysis report

Static analysis result for SHA-256 e01c21ff89e53a52…

MALICIOUS

PDF

107.4 KB Created: 2021-06-11 16:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: deb39ef75567a5785949ffec3c1a75cb SHA-1: 84844dd0e8c9bc4bf7f7d805a380cfaa60edff27 SHA-256: e01c21ff89e53a52d1de5c93affe000341752dd79074d2bd1f3b06f23a6ff7e4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to various websites, many of which appear to be compromised CMS installations. The presence of external URIs and the overall structure suggest it is intended to lead users to malicious content or phishing sites, likely as part of a spearphishing campaign.

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://crewmak.ru/uplcv?utm_term=all+autobots+names PDF link annotation
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/1rqgcbmacfstrr4kgkhceuacto/repubazewizaw.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/80354906663.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/30568033226.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b1cfa055eec---42281916500.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/34q75521hb3hka9hljice74n69/57111242933.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/8922b22233a59781e7b4cd3f58d7f675/93126096418.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/0e55add6ec4d28d41c4d9012b2918887/2390806891.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/66859628550.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f58b047af4---20835626123.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607aeccee28c5---97951114524.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1438597c3c---76261318043.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/9qukm5jiscggt5tfnatuphnmid/49070053299.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c7928b476---11485054692.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e596b38938---85409926875.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_off00015bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BEC 3932 bytes
SHA-256: 93b0166d69b549f888687c8d7ef6d57d755605dd5efb2720a00387a4c97b7d19
font_01_sfnt_off000169e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169E6 4864 bytes
SHA-256: 552ec34cf9c9736c1e7a96da83891b9d24d926bb7a84e2cea6a36552db21202f
font_02_sfnt_off00017a5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A5B 11524 bytes
SHA-256: fd2cf70205e1cad5f5a475cd07cae7b592c5b03ad11f7736e6b9ada2cfd52fa4