Malicious PDF — malware analysis report

Static analysis result for SHA-256 819e4e5b60f3526a…

MALICIOUS

PDF

92.9 KB Created: 2021-06-18 10:11:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: fe2af5bb7c703198b2f3495c2057aab2 SHA-1: ffffe0d92f77ef3d224bef922531b96f255de835 SHA-256: 819e4e5b60f3526a015225115cd68466be26bded6ddd55a34cd35e96ee9d3b25
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

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://coretry.ru/uplcv?utm_term=categorical+data+analysis+agresti PDF link annotation
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/e3175da4672eada97b89f441b3f015b4/tinazeb.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083feb1776b4---86694359339.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/34098220924.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/pekap.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/2rjh5m9tnhs5q5ve5a2gj8o1be/91724604102.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a7b1dfd87---51850897084.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781cbf64d2e---zodanodulug.pdfIn PDF document text
    • https://lamthong-marchph.com/piceditor/file/42513156698.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/48c1c3c7799b4160a4d11963b514bfaf/36698652142.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/b1e1332658b422146f33a6bb573f682f/51129190603.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc6b746116---lurikadufiranukozeretat.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/xozixawitaluxevalobudava.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/zomulatulenani.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/92554607448.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/81359966857.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/dv9gtgjs540d6l9fqnp4oe1jh7/35713113199.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED1 5112 bytes
SHA-256: e9f12a946bd86d0851e84fccf4dc46a0d8c52922182ee78901aed05fb80b6243
font_01_sfnt_off00014047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14047 11024 bytes
SHA-256: 92053f368e47be11b8da38199e9c2586aa7ff06363102d25b831acdb1246aa5d

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