Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c1e1f855b206bde…

MALICIOUS

PDF

87.7 KB Created: 2021-08-08 04:14:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0f3341b9f8c280b7e1185a0488591db3 SHA-1: 82ef108354bb0b880869db3105bf0bfb902a5e27 SHA-256: 0c1e1f855b206bdef6b77e356a8fbd9fc170e997e047df417d4906cd96108b44
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, forming a link farm. The primary heuristic indicates it's a link farm designed to redirect users, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=what+is+percy+jackson%27s+fatal+flaw PDF link annotation
    • http://adria-ex.com/99547062906.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098d1a7e0820---20124665491.pdfIn PDF document text
    • http://acquadiqualita.it/ckfinder/userfiles/files/lupilufu.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/6118205778.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/55961255073.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d57bd71c02a---bubovopidapegavodi.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/6d0cf73b24c605df4dddf2a2a2bb4f39/29567468918.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/2333744ed1d52eb0cfdf311ea1c419cf/59097621144.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075332411f0e---likidibupadipanoworiniguk.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160afe32eebf1b---fovepirakulada.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160798b7c2d961---fipirevogewemozow.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/julifogititarakatafifu.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/10571401864.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c14e14cbd0---loponuwoz.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/kabunotawud.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/wekezubomafokiwe.pdfIn PDF document text
    • https://jdlpartnerss.com/userfiles/file/3295773296.pdfIn PDF document text
    • https://fond.ru/userfiles/file/sivegiwirurevusuk.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a13a8ed2ef0---44064002658.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb4f5df72c---xezeraji.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/b259ca1a5e89e696fd33ec1b01e24c7c/dunotoposibuguned.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/8618c13c87f4aff4c27862b05e8e6660/gojapobubu.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_off0000f027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF027 11024 bytes
SHA-256: f543a52e6fb2a1759a37edda6346554371c337a12bd452d305fce8bf1ec72de4
font_01_sfnt_off000109db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DB 18080 bytes
SHA-256: 62f7fcf0df7a8491072ef97dbcc465a04348a6bb9d3f6945c5a4cdf61755f2bd
font_02_sfnt_off000138fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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