Malicious PDF — malware analysis report

Static analysis result for SHA-256 92f3eff2b7015276…

MALICIOUS

PDF

82.0 KB Created: 2021-06-13 20:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: afecb8844f5b3515c72be709d8099a44 SHA-1: 48f3c8e4f123d0ca4938725e46ceebce3c463ad7 SHA-256: 92f3eff2b701527602a3a7dcfbdd87eeba1ada344a6a2f148c172753a07b9c9f
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links pointing to compromised WordPress sites, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aligning with a common attack pattern for malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://huntic.ru/uplcv?utm_term=blanching+of+fruits+and+vegetables+pdf PDF link annotation
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/5cdcc908f49d6d57b56081b776b0a87f/revisejasotatikolo.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800d79b12f8---derekagu.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d253e76390---4055233806.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/bukav.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077414ca7d3f---dunap.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/h2cesfhshv5n4osvlhvtjqbb54/16470009030.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16093fd417113e---fezeloj.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/0aded72c43dbbd5fbdb38ba58d0c096b/19405188102.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608303af44792---sisazidoku.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/17734950329.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/67295902343.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/cfc3c4ec20c399a4a2bc43b35787d4cf/rowifepixabobazidir.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a08763b3898---14509564783.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/rasatejoxogisobodiw.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/e489d05656a5246d27a2db2f1adddff1/kuxagoj.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/2f9661eeff4cf337b347593969b2b2ec/12559841520.pdfIn PDF document text
    • https://vpntraffic.com/upload/files/84647545327.pdfIn PDF document text
    • http://dzbnf.com/upload/file/%5C/wenusovesota.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC1 5668 bytes
SHA-256: d608cb3d11478c529e5a373174dc4829ce53995d5e8335802fba40ab9779d13f
font_01_sfnt_off00010207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10207 10368 bytes
SHA-256: 6e86adbdbf21f20c85b0a627099b0fedd5d189f3c5fe594baf28d29080154b95
font_02_sfnt_off00012580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12580 16136 bytes
SHA-256: 836ab3fafa1d23e35e14e192ec86be8fe8e931eee4b8c79d5c7bf23088570f18

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