Malicious PDF — malware analysis report

Static analysis result for SHA-256 2623c9ced6336a48…

MALICIOUS

PDF

81.0 KB Created: 2021-09-06 12:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 88445d1ae872bee7221b48f8bbe5bace SHA-1: 3751eaca642ad3b6b348157ec6025717e87d51e7 SHA-256: 2623c9ced6336a4816e587f58125a1d5dc02479ac8b3a19bf654ff2b2ab79db8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to potentially compromised websites, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the use of disposable hosting for these links, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/mg5d1jm0gg7m68rjvh98t2a9ep/mediruvoguwu.pdf In PDF document text
    • https://bbmint.com/userfiles/file/57589883849.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/93813711074.pdfIn PDF document text
    • http://imoroz.by/upload/file/27268660255.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/vinedirew.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e368c5d304---govoxakaxox.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/jm36cue48de68otu4d8rv3fi7k/motomuzovinawumu.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160db344f6ae73---xorazel.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/18909558348.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/dqv9eic3lb6l796nbqasaibkpd/12325677311.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/e943df90e816b2a976cf53ce47c254bb/rakupuzanopuguduwamew.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/kodobasoji.pdfIn PDF document text
    • https://epiphanych.com/images/file/18482447032.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/a6339810fae69c7cb9dde607d5f01dd9/vatononu.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/4v882d1qv0i5k0k4r1u4vt4si3/fedej.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/suvenojewob.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/47224238070.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/rilaxezewakamodawu.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/77c3cbbce7f93569f2aebe99c76a3bc9/32596577483.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/eaa5076d2dbfb929bc89bf9ae815aa59/23387095258.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a97ca4678cd---zarupefimes.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829c661f7f5---guwufemujazexiseje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=manually+remove+trend+micro+officescan+xgPDF link annotation
    • 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_off0000d453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD453 11192 bytes
SHA-256: f62709f0c85d96b8eeb4b5ace85192ebcad982770f79453e61102bd84de1ce4a
font_01_sfnt_off0000ee60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE60 17796 bytes
SHA-256: f5d399b111010d5b55ea5398f827e1f04185431a45a0e77a3c1c746e5c5a9343
font_02_sfnt_off00011c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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