Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9399593488cc789…

MALICIOUS

PDF

89.6 KB Created: 2021-09-03 05:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ea405829ce5ca69b5bdfd9ebb29fb872 SHA-1: 40ef3775b103775d64d3440ec3d31b8d3e6a48a5 SHA-256: d9399593488cc7897d2e03b7118b28a27ac1462dbd0db1ac9fe13f4554a9fc1b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://drafthe.ru/uplcv?utm_term=inversor+de+frequencia+-+manual+de+configura%C3%A7%C3%A3o+cfw08 PDF link annotation
    • http://panegovernance.com/ourprojects/chowki/UserFiles/file/vugaxarebom.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16079752be66ca---14401648236.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/jc8ioflmufi2918gnc6pu3pqg3/82499597944.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3281f820ee---govixabonejukatiz.pdfIn PDF document text
    • https://clinicscrm.com/img/files/860729510.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dde0787a31---dogipagax.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075524806430---22518422154.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/fanutomaxozujojodutawi.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abbfbc47e33---zutenekawasefotufa.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/bubuzeki.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/pafepizol.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/gixuveto.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/37697312554.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/61510532589.pdfIn PDF document text
    • http://dsfly.com/uploads/files/fogewexadegev.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9ec2e866c---zodesikusab.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/muzowuzonal.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/26221992371.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607224247781c---zajas.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/2sfqna724abevakdt43ni8l7f9/nusegaku.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/fomev.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/losizivepojetubepu.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/918c517e30ef76f1b4cefb1611f2fc83/21212947615.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/54403986788.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109007c07ed9---8082347675.pdfIn PDF document text
    • http://bethelcommunityone.com/clients/880032/File/naxet.pdfIn PDF document text
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/vitugotisoga.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_off0000f10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10921 19892 bytes
SHA-256: f8d01b0fec9542d909a70714160c220b1f31e7fd34a5e0e56fef669744f6b37b
font_02_sfnt_off00013a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A1D 11896 bytes
SHA-256: db2ef5d2fdf60b39e992ae0a5bcce75a886090a5cc4d9068431ecb5e0165fe00

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