Malicious PDF — malware analysis report

Static analysis result for SHA-256 46cbe31c39dc25c2…

MALICIOUS

PDF

87.2 KB Created: 2021-07-05 14:19:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1ed0cdbfa691e1622b5501c1b06e3648 SHA-1: 55bbb86e84cb8ba8f078cc82d608e9ca6975ea85 SHA-256: 46cbe31c39dc25c211234b9205dfb6eeea33529f1d30d3e81a3d51fedca9e62c
204 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a phishing lure, specifically using a 'Browser extension / update installation lure' to trick the user into downloading a payload. The presence of multiple external URIs, including one pointing to a compromised CMS upload storage, suggests an attempt to host and distribute malicious content. ClamAV detection further confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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=latest+ccleaner+pro+with+crack+download PDF link annotation
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/9623a92394f5de056c276fcdff1e250b/19866979398.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c92cc1e61---ranibog.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/28152651402.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3385fdb9e1---juroxalopufokegokixisasor.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d32b4ed361f---85645868814.pdfIn PDF document text
    • https://notrepanierbio.ch/userfiles/file/madaxibojobinigonobe.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/33418315202.pdfIn PDF document text
    • https://serka.com/serka/upload/files/dolalirasu.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/xavotusironegob.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0aa63b00b2---biwifadaramosapusagupasi.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/4569267412.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/200751519589.pdfIn PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/75935727961.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/78539313598.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b47b00f93a---boxiporim.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/wiwolominip.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d665014b5c---35803125061.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/37163125482.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080da5deb27b---62337013508.pdfIn PDF document text
    • http://mhs69indians.com/clients/864804/File/jizimitizisimag.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/r6v6vb2vklteqka4djov92pm56/rababoragusemapapatosuxa.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11a2547cd4---pikufozerunolewolozalumip.pdfIn PDF document text
    • http://austintownfitch1980.com/clients/879833/File/sawomup.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/qrssc6cq6runs5q9p64fm69216/17567364754.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_off0000f193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF193 10748 bytes
SHA-256: 425c336ef8d30906bacb9ef8f0662814cd771ceccc544d3f443ac5e7682386b4
font_01_sfnt_off00010a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3D 17104 bytes
SHA-256: f407a630f08c142f9377ca50a74572e81523f99101f9bc3a7f918fbbd7c13e4b
font_02_sfnt_off00013702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13702 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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