Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dc13a736094bbdd…

MALICIOUS

PDF

76.0 KB Created: 2021-09-07 13:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2f0c4f3583a5588a454ac8df2c292591 SHA-1: 24b97b4b3204ce1b0a087c6ac578e003d905df4c SHA-256: 3dc13a736094bbdd32e5fa72c648c04eabd93e7b7331a518c8d8f47ca628b158
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, including ClamAV's Pdf.Phishing.Trojan detection. It functions as a link farm, containing numerous URLs that point to compromised WordPress uploads and other disposable hosting. The primary purpose appears to be directing users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://krisoc.ru/uplcv?utm_term=sociologia+da+educa%C3%A7%C3%A3o+rodrigues+pdf PDF link annotation
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16123b5cd8d99f---57314601095.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/pupinuxamegogotegofe.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/sffopbcf84cc1vlejttlpcidq1/duzakodadufagisuxarek.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/34534532435.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/lipegasijiwutigudo.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/29497222585.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/9c8ad873b1f55009e7d8c57d1c757a71/93604608565.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/78876378402.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/v0rj4f5l1s8dh3i4tonrlr213k/46611108720.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c971b47b70a---ditewevomowipofumowu.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/a4ilku5tufj78sbi4ki4hqknjm/sigawepefotezinaluwik.pdfIn PDF document text
    • https://epiphanych.com/images/file/88849101256.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608896d28545b---wabojafilewoj.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/35819366092.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/wezomatemijijepaduta.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/59808761108.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/reladebase.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/zobodokarojef.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/44361276795.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/72895229891.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/60ea6cdeea7cfbf0bfe66b390459b8a4/pimer.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/dojowegu.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/93805720415.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/jolokudaroduvefeduki.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_off0000bef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF6 11232 bytes
SHA-256: 9426735d147193e05927853c6ce2198ee03a37d1caf4ca67ed6eb4b606a628fb
font_01_sfnt_off0000d874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD874 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF086 19312 bytes
SHA-256: bfe6cc9d6531b93c8928a4fe749e7c6f4fbabd8f1be384de444dc0841a8ed73d

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