Malicious PDF — malware analysis report

Static analysis result for SHA-256 6948dd39f0811dcc…

MALICIOUS

PDF

114.2 KB Created: 2021-09-04 01:27:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b82936c5dc41ebc2a33b1f7325968f4a SHA-1: 6de2e64daff5c567a1381a7c26cadf540ab78682 SHA-256: 6948dd39f0811dcc9788f620549de369afd90e6485332bb86c97e14249a827e7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely downloads and executes a second-stage payload from one of the identified URLs, such as http://fzcce.com/aimgs/uload/files/1888200048.pdf, which is hosted on a compromised WordPress site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9830

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://fzcce.com/aimgs/uload/files/1888200048.pdf
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/jadozenitegemeb.pdf
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/60337662871.pdf
    • http://vitaminyplus.eu/files/file/97696003132.pdf
    • https://shieldtech.cz/ckfinder/userfiles/files/lafufevunuxem.pdf
    • https://silga.ca/userfiles/file/87294914658.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160fdb63d01a1d---nurumawabuvabererum.pdf
    • https://steklo-shik.ru/userfiles/file/18771205311.pdf
    • http://evopizza.lt/ckfinder/userfiles/files/17051610458.pdf
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/gijeminomudexesetinezusel.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/madp2vnnlpcpvbf618i9qifes4/gususivinaj.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1610c649d80434---xanexivinabijatu.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ed55144ad---gavox.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/014f8acb7873f13a6e7f45d3e3a8ceca/wupezejawogetetik.pdf
    • http://asbu.net/uploads/FCK_files/file/xiporawakitavaloxuteput.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/af969d07f0833f5d5326af8ce899031f/51411652374.pdf
    • http://huichem.com/ckfinder/userfiles/files/64100753903.pdf
    • http://toyotaquangninh.org/data/dulieu/files/25649259238.pdf
    • http://grandchainfamilyfoundation.org/clients/85333/File/77590841441.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/atjv9f0jlc32fm37jns8atuml1/nimujelusata.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06fa65d0ff---79758171789.pdf
    • http://119pump.net/d/files/tigixutubo.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1606d13cb10dd4---desirikatawerotabenotor.pdf
    • http://bienbao.net/uploads/files/95984372599.pdf
    • https://resonanceacteurs.nl/userfiles/file/wakobazetateku.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b23e554d8---vifirotegugemodu.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160f785cc010e4---50493729608.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=karcher+puzzi+100+parts+manual
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013f69.bin
051a559f6683bb16584efea71a3dc7088f3ac111ae4b090890e1911104098b34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F69 25732 bytes
font_01_sfnt_off000180e2.bin
6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x180E2 1680 bytes
font_02_sfnt_off000188de.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x188DE 16792 bytes
font_03_sfnt_off0001a0f5.bin
c8be0abf84b02af6797c6479514ed4be8aced6a9ba4bdc42c770bb0841baea5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0F5 10844 bytes

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