Malicious PDF — malware analysis report

Static analysis result for SHA-256 3741b79b65cd4a49…

MALICIOUS

PDF

70.3 KB Created: 2021-06-11 08:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: eea8f98f7dc4a550e82431f56a49a9b4 SHA-1: 464f861a624150aaf3f643488457339855d3d649 SHA-256: 3741b79b65cd4a49b2560c0075a20b43d030296171ac3dcd44c77be108764851
154 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm or phishing lure. ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, with no clear user-facing content beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7986

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://archism.ru/uplcv?utm_term=industrial+organizational+psychology+studies PDF link annotation
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f5237c1e7---pupanefefafibusinu.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076dffacdfac---95314762859.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d67803860e---kunelo.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fc47b3e9a---zomovev.pdfIn PDF document text
    • http://nktrading.qa/file/files/lulesumomofesuwapiz.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2dee623d8a---18063401124.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/981f1136c128acd60fd9a956c78cbbbe/53799213532.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/vuvejaletovudapuzusukaxan.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832ad49fc60---vutuj.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a417ce48938---pefobujipotinoziw.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ab1ed9aba66---17251313209.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/3ad4a33d7b70a3ab2e97a763c838c53b/rivetipetosa.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ce2e29eca---gasazobavebajo.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b465a45c0d5---36726301822.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_off0000f1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B3 5424 bytes
SHA-256: 3694546d89a79b5edbce2245e36d068d0c4f6cdfb86935a108e7f50227dd6980

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