Malicious PDF — malware analysis report

Static analysis result for SHA-256 d050c9bef4df7981…

MALICIOUS

PDF

83.4 KB Created: 2021-09-05 08:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 35491a86d5aa99e8d51238f574a77130 SHA-1: 6c7d66c48689d881e9cb053e2e86045b35b60843 SHA-256: d050c9bef4df79813842d702cfcea2234d257a0b25b1e4aa32849d5caba0b599
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 0.9977

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://krisoc.ru/uplcv?utm_term=gleden+med+skjeden+pdf PDF link annotation
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c660118cb---wotiwukatanuziwat.pdfIn PDF document text
    • http://ridendo.cz/files/file/pimuzapolavuwisojofeluxun.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ff6b80c1f8a---woponiradamatuxan.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/boveniveraf.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/rixexixivowebobapefaz.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/a6013fab75c788cb644b7b9be924530e/xaxobemotodunut.pdfIn PDF document text
    • http://crm333.com/documentos/file/bavigatojiletirarevixow.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/xavosegivebigagusalurajat.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/3a7c0f7dce3279fd25e337203a87e7b6/wasukefojidefuduzonenuwit.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/wigid.pdfIn PDF document text
    • https://veljun-ldm.hr/files/topamexegimefov.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2274e00ac4---bojotinujobexor.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/45414387280.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/30205732889.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/21374068702.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/zobadovaxepajuzusujinifa.pdfIn PDF document text
    • http://specimport.by/files/files/watasarawomezisoxajuj.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/f3549156517b0d54b3fe0bb5043eefe2/vorajebot.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ad6691fb9---77147173575.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/rodevat.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4415cbd8e---pixojugulawoxapefe.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/fatixarugalu.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/73858637242.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_off0000e02e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02E 18652 bytes
SHA-256: 62bc362c3de0adba9d8df561f17b150b4d8f5f63eff1b908ebd081fae04e893c
font_01_sfnt_off00011092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11092 10348 bytes
SHA-256: 347491a5f7e1d7ef105ace65357a799b9e5b1e32be7f86b29821ab07688a8475
font_02_sfnt_off000127ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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