Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3d9c6a2ba8ce431…

MALICIOUS

PDF

88.4 KB Created: 2021-09-08 04:59:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6ef0d3ee8dcf74bfe7475cbc3b2ebfcb SHA-1: ba9a7eb90ffd02eeee8da68eb438364c1fb89b00 SHA-256: f3d9c6a2ba8ce4310506f341493c5156ce0cf5b4ae59eba7626ccdfae4d09471
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and presents a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The primary purpose appears to be distributing a second-stage payload or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://damiel.eu/userfiles/file/55113530797.pdf In PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16088cc5d021ca---roxanupetobamofufozawil.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077bb3590155---37368185342.pdfIn PDF document text
    • http://yi-xiang-yuan.com/CKEdit/upload/files/girudidaxelababav.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/2u51s8m0ou2ktu812tdtn61bv6/tebibirusorimovafa.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a87a13ca39---tidop.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/22193209084.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xejerulazora.pdfIn PDF document text
    • http://cascad-trans.ru/files/58630601520.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210819_174231.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/nibebodinonubekuxonevaluf.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/34944573764.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/62871969509.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/87b1aaaafdf6427af45a79599a1591d7/51107354807.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b40edf2322b---44066821785.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/20534461981.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/3462d27e188e5e0473def4d0fd4e56d2/rumugerukoto.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/9354f73ec78b418f548cc20e6a372367/jizemexigosoluk.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/56f2780dc5babb85c3833e2ee90dd3a2/xomasudatelutozug.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/tazor.pdfIn PDF document text
    • https://cpc-serbia.org/js//files/4211295139.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/47619509001.pdfIn PDF document text
    • https://texasbordervolunteers.org/userfiles/file/vasum.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/tuzupuzonomaraxuxubagos.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b13b825836---varobomiwakejevirikuv.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/0e6db7e4594a4c425a35f39144fa4b88/wumixajimilesorez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=oxford+atlas+of+the+world+pdfPDF link annotation
    • 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_off0000f4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C1 10612 bytes
SHA-256: 727725000851e0412a29257f461dcd28c26019af21e21c3aed93a8846b79c7ff
font_01_sfnt_off00010d42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D42 17792 bytes
SHA-256: 0c1be29a98131062bf521c874e75e200a4c597837f404d2d54fdca12f04dc497
font_02_sfnt_off00013b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1