Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f9ad4d11dca59b4…

MALICIOUS

PDF

148.4 KB Created: 2021-06-20 14:35:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d163f562e0d3842036c633b71d6efb2b SHA-1: 3e43d18a92dbc3b2a19a1ae22c992a0bca3f1908 SHA-256: 4f9ad4d11dca59b4d8446b4268275f1bab9996a16d5de8c7da573690cf7a2597
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links pointing to websites hosted on compromised WordPress installations, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://inwebjor.ru/uplcv?utm_term=the+cw+crisis PDF link annotation
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/8b195qtsligm03g86foii6gksv/24553351960.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160cba2f076a7c---11880766538.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/82s0qmd0c9ar0vg4tausjqjq9o/tipikomibifimivijupopor.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa219b7a21c---xegutar.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/52638696983.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/32746366984.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098c6b2f1675---84980648213.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16097cca39f10f---34457994838.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099b1d28d2b5---16132341163.pdfIn PDF document text
    • http://sciattella.net/images/file/wunenifokodu.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/6p887m43lc9f0def7f11v9vja6/93315093845.pdfIn PDF document text
    • http://teenaramainc.org/clients/875997/File/58876272596.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/fosivinakebizes.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file/%5C/2021051606442162.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000245da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x245DA 4684 bytes
SHA-256: 208214617a56f67f161eaa400d9880fd6f46e88047eab66cf978000a7872940b

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