Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c9142d7273d0451…

MALICIOUS

PDF

86.7 KB Created: 2021-09-20 22:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e393d6a412ff91cd5733baa2520a6d3e SHA-1: 67d06752131506bb73c1bcf7bd8fbe980ef43369 SHA-256: 9c9142d7273d04516dc2455fa364bd021bd54892f6573d29acb918249dae96d9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is a link farm designed to direct users to various external sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://drafthe.ru/uplcv?utm_term=read+the+wait+online+free+pdf PDF link annotation
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/33668bc868e0302fb8ce5fde3ebb2164/49441826895.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/3497978879.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/zuvubazirukowodiruwi.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/86322339152.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210904235342.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/11957578563.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/femelezumikufirupot.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/16002148025.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/kosojomipudufufutukemide.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/vimagomiwivalofodol.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/14185166663.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/sedulor.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/94500029049.pdfIn PDF document text
    • http://agro-partner.com/Image/files/rizobovepikakuze.pdfIn PDF document text
    • http://allier-genealogie.org/File:/damazo.pdfIn PDF document text
    • http://savemaxint.com/files/file/6767009773.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/48225024296.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161407d98b6c61---vezudipedizenovo.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a14d1ee2d---93707397725.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109120348173237.pdfIn PDF document text
    • http://sayarbobinaj.com/file/338709385.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/161354e80374e3---juvawumimexipakalijep.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/96892136131.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/rateranegalutededaji.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/98681277454.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_off0000ecf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF4 10560 bytes
SHA-256: 41b699057b55e991c58e8a8b210cd0178291f45163baa4b445c855700a9a9b1f
font_01_sfnt_off000104fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0C 18676 bytes
SHA-256: 5802ea45b8d10965f6d5d64fbeeaeee8a1a924d131ca37c44d6df836b12802d2

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