Malicious PDF — malware analysis report

Static analysis result for SHA-256 c24749a86bb89398…

MALICIOUS

PDF

69.8 KB Created: 2021-09-28 10:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 92c574a6be585fcb764509cef0b03b78 SHA-1: eab04851a9871044d6a0cf814cd2f184ee46a584 SHA-256: c24749a86bb893982ebe2aca3dba4e77b2dd6d4e7e0451ffb03f32759bd27051
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. It contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS upload directories or disposable hosting. The primary function appears to be redirecting users through these links, likely to phishing sites or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://crewmak.ru/uplcv?utm_term=best+jelly+bean+launcher PDF link annotation
    • http://metalzilembo.it/userfiles/files/56989882719.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/puzel.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/41174701191.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/marumizigigu.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/figiwijeguzupemani.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1614a3fc34360b---xowegi.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/pilaxo.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/47716879608.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/82673105029.pdfIn PDF document text
    • https://duel.pl/userfiles/file/xuzipeposukeb.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/48368250762.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/83288319766.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/bibekowujevuzani.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/13206066924.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/lezafunowaziwu.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/75932721571.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/5719204727.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614879ceb766a---jojolipa.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/92030972104.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/latawev.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/86106654700.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136c8177a69a---70841301127.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/21ep16f20fpb1bcvde4rf219r6/77881580547.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/1632ef8a4253e0bbbe695827f59cee89/jalajexenuliwinopufu.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/nigagawizimarekeda.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_off0000b0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E1 15820 bytes
SHA-256: 8e46e05c53e26d5714ccde6c09022e63804fbb5a8e58e82558ab8f042069978e
font_01_sfnt_off0000d900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD900 10652 bytes
SHA-256: 6228fbc73ec8ab4c5e091fc6c7aa24ad0388c13837fc535e5a7630aed595f767
font_02_sfnt_off0000f176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF176 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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