Malicious PDF — malware analysis report

Static analysis result for SHA-256 86961702e902a3ad…

MALICIOUS

PDF

85.1 KB Created: 2021-09-19 11:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 63f4c194873aaac4349a00f39c8ee506 SHA-1: 99e9f8b921a777142e23ab74c05723b39ad55936 SHA-256: 86961702e902a3ad2e359de37c979e138767263172b0b90e6cdacafd609b2e1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and the nature of the URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://infrive.ru/uplcv?utm_term=easy+things+to+craft+in+minecraft PDF link annotation
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137102c508dd---22650434805.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/zaxumibixig.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/81337965673.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/movenakuvipivudoluxudes.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/67658177342.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc9d2d714e---nizezazopo.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f1255a3a7---wenepudomoxixanofosiza.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/posizimigarixiwilemu.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/70708712968.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe04fa80ba---74609947285.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/labigamupad.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/jepuv.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/86821680205.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/50838192664.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/73346943852.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/85683439007.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/16697700221.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/minebejidigigumaju.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/800d5540455d56e6b56cf540781b97a0/xodugo.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/josazor.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16143928575e0e---41025552987.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/3e045d2378bbbdef8b97070cb7044f27/wiwusofukixonunonumoz.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE953 10832 bytes
SHA-256: c2bfd8213bf48e9e8c977e1fced27ed9e4ce732936ac183adf4489afae6bb0b7
font_01_sfnt_off00010230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10230 17108 bytes
SHA-256: ffa3f554ee02518ffdf448e9fdb631ce1df9bab36793ca2238f3b562a8aae7b5
font_02_sfnt_off00012ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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