Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e7b64ca994f54b0…

MALICIOUS

PDF

69.3 KB Created: 2021-09-14 18:04:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 21bcd7e74a45ac76e487aea811ec9f47 SHA-1: 9bcce824f7701becac926a588d0319ccccfdc76d SHA-256: 6e7b64ca994f54b000ce8e3fa7d8c50930e247503c0a63fb99048d0040123d7b
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=what+is+mtk+logger+android PDF link annotation
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/98393682839.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/62556482217.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6c6b89c16---mosezuwijonexebitivuzilu.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/11312987907.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/76863513522.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/xemedos.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/xojusedafobiseku.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/wepizev.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/bowerixuvumolil.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/jorixoma.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/serero.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b348c4ae2d---6319117502.pdfIn PDF document text
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/94040877622.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/35201471460.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/10823920578.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/41897999260.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16132283b492ee---33142653466.pdfIn PDF document text
    • http://foxhill101.com/userimages/sirofa.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/juwaxevituganadesupiri.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/penonotapajigagedavavafon.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/teduxijapepejinez.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/44829015648.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/95437720067.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c59eace48e---73436321993.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_off0000b193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB193 10780 bytes
SHA-256: 54b008e198f4f96c404c049b3117d12749268f15bd73f242048fea49ea562f21
font_01_sfnt_off0000ca02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA02 14936 bytes
SHA-256: 74aadda8551c70a657436cc234140c69a8cef4b7239a0afd4fe7087c2fbf70f4
font_02_sfnt_off0000ef5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1