Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf47b2495a2dc3a3…

MALICIOUS

PDF

121.4 KB Created: 2021-07-23 17:33:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6569f3396dbdf0b41c6b03498c4bdea8 SHA-1: e1d9987397a8b7614ed1c70dce8bea08594bbf65 SHA-256: cf47b2495a2dc3a3b62171be3e5f8a887bd0b50a743da6ace8449cf6d8a43948
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous compromised websites, likely intended to host malicious content or phishing pages. The PDF's structure and the presence of external links suggest it is part of a phishing campaign, potentially delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 http://igigeothermal.jp/userfiles/file/78008064376.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084344db451e---90235800078.pdf
    • https://parklanehotel.asia/userfiles/file/jomej.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160d421ff0650e---58504894675.pdf
    • https://travelinnsuites.com/nbloom/fckuploads/file/56594788909.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/284ff244a3ed55699206eb5e0570131e/24993855346.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8f54639796---romurefejagaxenatasozafaz.pdf
    • https://client-sms.com/ckfinder/userfiles/files/45576162402.pdf
    • http://controldellaves.com/app/webroot/arxius/file/25904648614.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0ca13c778---lutifusa.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d7b5rlr4k5tchmq07rtvu23au3/53435640331.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/6f073d3537e91be4fdaf7359db662703/66576863444.pdf
    • http://jdjcnc.com/upfolder/e/files/20210712222155.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/kl4lcip0vmb0gp4etj32l6p810/91649316865.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d42176ea70f---11826899060.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090300b90487---foziwuditakupesawovu.pdf
    • http://galsabino.it/userfiles/files/12765638237.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/fkeuajndt2p2qop4paa2pa8on4/89950797851.pdf
    • http://proxima-design.cz/files/file/wurefijemixe.pdf
    • http://files.ibiza-ferien.de/file/24523813033.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/saehgeic0fclmh0i952u7k0qqs/bodiju.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160986cffd1cf4---75901466075.pdf
    • https://partnyor.az/userfiles/file/85144779055.pdf
    • http://pnktools-th.org/ckfinder/userfiles/files/fekax.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=les+livres+de+rudolf+steiner+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016cca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16CCA 16792 bytes
font_01_sfnt_off000184dc.bin
5a6b902c157f6915e6db11c0dc1e8cbb56ce07aad9a323e2dadcb687f93a3486
pdf-font-stream PDF embedded font (sfnt) at offset 0x184DC 22980 bytes
font_02_sfnt_off0001bd33.bin
a38673a640719acfa7580d25ffd795f2eea53b370b9202dad03e95541aceea04
pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD33 10452 bytes