Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e55503eb9996bb2…

MALICIOUS

PDF

82.8 KB Created: 2021-09-06 18:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a9ce9b6d2a10bc83dace9c8909925ec6 SHA-1: cfca3350306b25e5b108b949f55fc939596b2d06 SHA-256: 2e55503eb9996bb267a2b4f898710a840690836ab7b53133cdb02a24f279af89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs indicates an attempt to direct users away from the document to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=cbse+class+3+maths+practice+worksheets PDF link annotation
    • https://www.iieng.org/editor/ckfinder/userfiles/files/36776781936.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a525e07e999---madax.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/94293036641.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/lekamovisabu.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/sabizifarebufezikijexijez.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/660e13bef712b6395d5beab3cea1348d/46703485382.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/7149701695.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/wipiwixevatedane.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/maranaxoreduwagebi.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/duradotimoxi.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/jutotakijenusepev.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/cbcb8a5b18e0fb305c5b004790dc971b/53462403747.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/raroxonegunafizejipur.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/sajanerawutegakapolupeza.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/1c6616b6b2800d6a94c59f57e5d252a9/vixij.pdfIn PDF document text
    • http://poliinc.com/upload/files/73055691118.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747ab9938aa---39457484186.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160aaafeee47ee---rotubogobisivorabo.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a05560e4ab4---sidurevunofuputilemu.pdfIn PDF document text
    • http://sibservis.com/ckfinder/userfiles/files/vemofakewitutimufuxakome.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/40d63765724ea33c38e09f1bbdbbabdb/97062973527.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd1b521bfa---43098617780.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/sivusor.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-2/20210502103826710753.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_off0000dac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC9 11056 bytes
SHA-256: a7e4540bedba95e14a8d5ca5f734ac7af000137f3b0c479e31cd8acb8a2fba7d
font_01_sfnt_off0000f471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF471 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C83 18344 bytes
SHA-256: db31286ade96c1449dcb2f0baa1b0fce49fc48f3d208c05e1df9dc0663898063

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