Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc6e3e959d7f0554…

MALICIOUS

PDF

70.3 KB Created: 2021-09-09 14:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 00b3582710fdabf6fc49de2638c9eb78 SHA-1: 9d4141b9d5f67c8985581585944e01ef91aa8af1 SHA-256: dc6e3e959d7f055428839bf74ff0fe80a479609057af5e191e492a43e5994e43
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier further indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6577

Heuristics 5

  • 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
  • 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://pet.nfe.go.th/m_site/ckfinder/userfiles/files/26724742649.pdf In PDF document text
    • http://snuhonors.com/userfiles/file/21085031161.pdfIn PDF document text
    • https://webhosting4.net/media/file/pivosujopevamofedotus.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109091024102512.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/18112013196.pdfIn PDF document text
    • http://recviem.ru/img/upload/41316017215.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/33314200873.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/83497581165.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16138f0d4d9e45---41028787390.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/36643251124.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/38520131423.pdfIn PDF document text
    • http://orderkai.com/uploads/files/66615369854.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/wisikifina.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/ripaxabajolutedijuboz.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/hq4h8l4bgculdibogcb3ptljhs/varizesora.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/zidegofusasuxepukupumivuk.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/31998576539.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/zubizozanifili.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f45e3bc47a---jurugijupopikiko.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/davozesimalimodinolafa.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/kokiganamalafoputasaguwe.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/49962503956.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/bowizutexevob.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210903113809.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=alight+motion+video+editing+appPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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