Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec6b381288976400…

MALICIOUS

PDF

72.9 KB Created: 2021-06-09 00:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ca443b52d0651739aa51ce18b108a17b SHA-1: 6473f1359e2b6eb2d5402a7f34c5f34a6fa76a0b SHA-256: ec6b381288976400f604f2b43d3d79cc093c925b4845168c6cdd68ae9e70ea1b
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links to compromised WordPress upload storage and other disposable hosting, suggesting it is part of a link farm designed to distribute malware. The presence of a visual download button further supports a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=solving+product+design+exercises+free PDF link annotation
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/bc6c55144fb02a0fa710cfcb8298d6d4/vagakosilesasewapaganugi.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16078ed0de9f10---dufaligufotovasijod.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072890a2577e---furunesunijawamoxizafewug.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1608ceacac8ce4---sonumaladetofiwu.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925b775259e---dimukejapemit.pdfIn PDF document text
    • http://industrialdevices.in/uploads/55147944689.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/2nbsh61j8g9e43kabd0q515pl1/94558566136.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba0439627c---gerosukemanubojanulojutij.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/zexelevuroponipoxifimin.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b76741013ba---madomedizopumumibegisa.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/9fc6a8f0e73b1f071e6499464c6c4fff/tuvogafowadawiw.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/d8f45cb890d912ecbd422893e0d3ec2c/lobanivibe.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/ponepedakedakulekonatazaf.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/nojukeparegobuv.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cad830df54---dodarosonaxulapeneza.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/21192266763.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCECE 5224 bytes
SHA-256: 5b57f8ed515be8dd3abba24f77d3b55a15d66d8d43f7e54355d0ad57a7ce2aa4
font_01_sfnt_off0000e0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AB 12088 bytes
SHA-256: a30a8e724096052b9681300bcab51ff0a7001231386a985cfcf1a8268ac0f632
font_02_sfnt_off00010842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10842 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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