Malicious PDF — malware analysis report

Static analysis result for SHA-256 40dc0b79a9997802…

MALICIOUS

PDF

85.5 KB Created: 2021-08-15 05:32:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 119076cc0488f4fef1d458229703153a SHA-1: ddfbfc127b975bbfbe149908d4690f917e1dae8e SHA-256: 40dc0b79a999780224175cbf73bb13a81240b7fd3bb2015e4e6237cfe832ede6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The JavaScript likely redirects users to external URLs, such as the observed 'inwebjor.ru' and 'sunsoftinfoway.net', which are associated with phishing or malware distribution. The PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further indicate a pattern of using compromised or disposable hosting for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • 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 https://inwebjor.ru/uplcv?utm_term=benim+konu%C5%9Fan+tom+hile+apk+son+s%C3%BCr%C3%BCm PDF link annotation
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/63514926819.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/qfb3maed92u930dvrnp5ig7bo4/83711986712.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/geriw.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bcee2ebe08e---vujijob.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/2248225817.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/wokiramitelizefa.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607615974d4a8---jenopo.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/8f501491ca9f9e23e201d8dc179d0135/93172615373.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607822cb00d2b---23325107113.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/jagobojonole.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/tesasufetovulufa.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160805fd329218---retosekipupevowubomilimew.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/9cdbafe5500824a3f204521318811ebf/63206050185.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dc0cc1ec5---80309745368.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d481af335---59745561019.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/46f5658ed1fb217795a37f7682051c43/41556223988.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a62a7fde5---94208405707.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/73812025334.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210523062430.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/jigisudipi.pdfIn PDF document text
    • http://ropesadventure.com/d/files/41244657768.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/riwogixefomisetijigup.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160825941d2bf4---5111347252.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/jagaza.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CB 1760 bytes
SHA-256: 478d64aad58a46c60a63c2bd6d05d9c39068b35528f549688063ac651822ff24
font_02_sfnt_off0000fc22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC22 19744 bytes
SHA-256: bf19d5b9e6c022e6005ecf82e6004333fcba5286ea2b981de033441bf4f98f1e
font_03_sfnt_off00012c00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C00 11196 bytes
SHA-256: d55046d495c8baa2526b27d132d35db157e3ca3e1573db1dd0379f99d90da918

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