Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca9b890b2710849d…

MALICIOUS

PDF

89.3 KB Created: 2021-09-18 13:33:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0c765ed818e40210e86bfa35d58e4b9f SHA-1: 8b470ca59304c55f66de257c8e5e629ed2655d19 SHA-256: ca9b890b2710849d3c697749c1e4d8f2d07805c815c82f6b77aac5ac35e4a3cf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised CMS uploads and disposable hosting. The embedded JavaScript likely serves to execute malicious code or redirect the user to phishing sites, contributing to the overall malicious intent of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 https://smidgel.ru/uplcv?utm_term=distribution+fermi+dirac PDF link annotation
    • http://thaoduoconline.com/userfiles/image/file/98515088572.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/mixise.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/88850348447.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16140eb6bec63f---89085710860.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/1ee50eb2effe315688b7f67971814926/43304772105.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/sumexenizubojuvo.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210913023056.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/vixetobixevumuwogeb.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/mamefalezumeteberu.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/lenunatinedamaminot.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/13005207741.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/24903293200.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/botajuguxiv.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/19790077661.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137eba66ad7b---xegajimar.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/1715600029.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133bf80584d4---pugedilije.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/74264013591.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/52554225898.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/16574361588.pdfIn PDF document text
    • http://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/98101532494.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/febuvulefujosatefodiropu.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/livafatebozutokasibupa.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/13200497566.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613581192aab2---97877585134.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/46491977939.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_off0000ef15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF15 10832 bytes
SHA-256: 41acd017023a64f52e63fb15ad2c286b1683e26a26d6e651cb88e0c9079124eb
font_01_sfnt_off00010818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10818 20948 bytes
SHA-256: d3686cf97c9cb63f7cb88738457eda7bd1da92b3bd7bf855ffc171fd2d098a46
font_02_sfnt_off00013f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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