Malicious PDF — malware analysis report

Static analysis result for SHA-256 c39b1af0126455f9…

MALICIOUS

PDF

69.5 KB Created: 2021-05-07 07:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 532a19f2ab552d77f6a4052302a504af SHA-1: 8df3c7795ea21ad2a1117d57e5321e9164002123 SHA-256: c39b1af0126455f9adfad31f424c2326b25945155bddf2d2611b1204f56236ce
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to compromised WordPress sites, suggesting it is part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs and link farm structure are primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9670

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 https://oniceh.ru/uplcv?utm_term=android+game+console+review
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd8fdde4d6---xosojamoko.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083fa76191e2---gezukig.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075e905861bf---75421581754.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/5b8t9blu14bsgbb1m8ahvsg34k/50941100064.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/pbp9vqi6474d00hi5nflhjq41a/lutajitipiripagi.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb60bd32b5---govez.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160747e19bb016---12177798973.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3b8bec5bb---zetitazositopijit.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/3c9d5cbbba3990c4359a4b840831f268/56587992437.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16072f8ab6e3a0---nobixuxigoj.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ed71015bd---54343695654.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/19d20d03ec4cd13defb6832f31e2d7b8/92267768526.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/dgf5rp4iqp9pnmtf1kq1thb7h7/65869176864.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/95mnftego5at9ldpg9tj7igtac/59618220766.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f57b84b77---60033603457.pdf
    • https://rockdental.co.uk/wp-content/plugins/super-forms/uploads/php/files/f3d54affc12e088a9e4433774a9d10cf/42409032087.pdf
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608bca74a1595---monufomezabiwubufusugabix.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1d77f1b2e---32806869011.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd82.bin
711c14e3b93c8a80364cd043baffef2ecf87abf569c5f55c6adf7042ae84b924		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD82 5400 bytes

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