Malicious PDF — malware analysis report

Static analysis result for SHA-256 391f0b996ba136b4…

MALICIOUS

PDF

86.3 KB Created: 2021-09-05 17:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: b6de4eceb7de627e1f0579825e337526 SHA-1: c40f59fa8726aee533aed9dc5cb89411e537df7b SHA-256: 391f0b996ba136b47a272b6b9c2f3bc92bd5e4cd39072ef9627b4aa741552682
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://infrive.ru/uplcv?utm_term=postpartum+hemorrhage+pdf+2018 PDF link annotation
    • http://kientrucnhacuagio.com/upload/files/vudimadog.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102d99b60c9b---90965790033.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/47834637297.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/fadukuzanuvuziferalanubol.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/jajukukeruxu.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/ksejo2ct6cquq19ebs29q7bdc2/jogifirewubo.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/966094f0e2f639395ff86d4718dbce6b/kemob.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16267257853804.pdfIn PDF document text
    • http://cke.hk/userfiles/misati.pdfIn PDF document text
    • https://vonia.mikludava.lt/images/files/69914865749.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/14684853771.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/livomosofaxaberoresitamuv.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a431eaf0904---vokizunemikufekefifuzuwop.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/48320559115.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/m5vgfdudarsg698onmg8povo04/nugudar.pdfIn PDF document text
    • http://datcat.vn/2018/file/gobewexote.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b6718251b4c---86300701669.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/35393485464.pdfIn PDF document text
    • https://seikico.net/img-tym/files/tivawaromebetexi.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16078fc7952ff5---majeme.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc2bd530bda---paderojo.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac941802fe---palaja.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_off0000e59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59B 11308 bytes
SHA-256: ffe7dba3fb4c5ca235636eae256b646cd1b2cf5e17e19ce96b4254e63cfec61e
font_01_sfnt_off00010024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10024 19688 bytes
SHA-256: 4f7bdbf9cb5e15df0ae37073504ef803d82235977063a3c1b6970c74ad51f383
font_02_sfnt_off00013362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13362 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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