Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b2f21f65dd31add…

MALICIOUS

PDF

83.6 KB Created: 2021-08-24 07:16:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 63e3d533fc4f95911dce52a08d9d5019 SHA-1: 93e46d5930ae0b76e50d7c8783c92463c91b4716 SHA-256: 3b2f21f65dd31add168016b11bf3ef70aef0a5de0c742789151fc350e6ed0bfa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicative of a link farm designed to lure victims. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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
  • 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://infrive.ru/uplcv?utm_term=meaning+of+federal+income+tax+withheld PDF link annotation
    • https://uniqrelation.com/userfiles/file/75927092854.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d22e203c435---mupudalifetetuzenizejo.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160896fbfa3db5---66255292263.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/robm63dk8ijil3v72r4h4vjqo6/totedusisub.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/49461643295.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/48266840807.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/6fb96d9aa17353fd17ccecd3278c0c58/sipobinilu.pdfIn PDF document text
    • http://zonwering-belgie.nl/ckfinder/userfiles/files/jigemazajabejabofininixaj.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/6b20ar30s61dqtrhjlcemkgast/76857693425.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/73bccb2f14301b8663addff80eeda6c2/60278152791.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/581e0e40cd3c1e9a2e6de4ffea86b2f1/joditobilirojukogejivi.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/61551584126.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c71e618d3---bowisomadirixurun.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/71166793258.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160912705126ef---84235430376.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ded745d88---zesibas.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210810102927_gbk588.pdfIn PDF document text
    • https://maturana.cl/upload/file/20245492815.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/84161545263.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2d99bd38e---soziganosopudipi.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/c07e5e11fe74f2c66100692741974119/36887236764.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/32665848960.pdfIn PDF document text
    • http://www.victoriousintl.com/new/resource/files/bemosevivoxolepategofe.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f007af744c4---pubepelikopi.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/gedosipifowudowes.pdfIn 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://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_off0000e315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE315 10936 bytes
SHA-256: 61a266249baa63b28c3b2ccdd730f5442affeb55af8c0f60615ca72d87c1e0a6
font_01_sfnt_off0000fc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0C 16496 bytes
SHA-256: 48f1c3c08842196aa9508173e15a8179ff69d9f0aea2aa8caf4d5beee4f22700
font_02_sfnt_off00012723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12723 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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