Malicious PDF — malware analysis report

Static analysis result for SHA-256 35fb72503aa37078…

MALICIOUS

PDF

71.4 KB Created: 2021-06-06 10:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: a49c0e50bccd3296d0ac744194859007 SHA-1: 9780e082fd1b9c7420e4f4c30cc957fb54978c29 SHA-256: 35fb72503aa37078f452f8b4256e793e9778669c73070238a6a09d8b743dd466
156 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to host or redirect to malicious content. The document body, though heavily obfuscated, appears to be a lure related to divorce settlement agreements, intended to trick users into clicking these links.

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://pistant.ru/uplcv?utm_term=how+do+i+draft+a+divorce+settlement+agreement PDF link annotation
    • http://markasib.ru/ckfinder/userfiles/files/bogidalad.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/vewovane.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/fawiwefoduwirufadebolide.pdfIn PDF document text
    • http://maydangson.com/vietkiendo/upload/file/46191169690.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099a293e71f7---xekinu.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021513535576852.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/88502075611.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bf01a7b9f---jusisoxa.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/bdb70dc199544b591cb0afb9345b6ed6/tijamofagadakasazamolile.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/33032ed986c6443f8167f3ab50c1eb36/29834168835.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/vugutebebeverumidizonex.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/mj0ruf04t2b6jll70kuepej4b6/giwoxowikab.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/f554579183f39a6e2fbcf02ce0845531/kewirinexupofosu.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/914f4f9447f72f47978fcb43016f5247/61389091433.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/3c807ad1889e051fda7bd0d49957e55a/rexolajoreb.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22036f1548---30619249113.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/6df8a4ac761eb38b3be0e06afcf7ad0c/rejogelomefikubatatado.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_off0000dc19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC19 5452 bytes
SHA-256: bd008a258f5a4028ce36a98b679939ad47daed78ce184ba47658dc9e3ead310e
font_01_sfnt_off0000eea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA9 9764 bytes
SHA-256: d5cdad986f822659faaae96c3e9676de21a0e6708230def9ad0f1edf9ac2e5d7