Malicious PDF — malware analysis report

Static analysis result for SHA-256 431d3d46844874ed…

MALICIOUS

PDF

92.9 KB Created: 2021-07-31 23:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8033111b670983f436744053897519c6 SHA-1: 011b0ec4a721d934f427ba1ea441654a811588d4 SHA-256: 431d3d46844874ed2bd6c91e7d3d1705099526c337dcd1d6eed4949bbbce7f59
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to exploit users by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ca5eb12cd---80019309929.pdf In PDF document text
    • http://vanphongphamhienluong.com/upload/files/mojuta.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/74014765026.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/rumibu.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/fa031a5134fc6cd61fbbaab45ee055a3/nazifafoxavutani.pdfIn PDF document text
    • http://shihtzufurbabies.net/clients/d/d3/d383cf0c90cf2d2391705d5438694b4c/File/jajotanogisetijofawiwom.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/luvunejotowigezita.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/31487779300.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/78565955302.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/hf280019a1b3aqe6k7pr6ta41n/balutufamuduxifepuritexot.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/36607210230.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/womewazorixozirogum.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/10377051499.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609439f47d1dd---38746635116.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/63827867746.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/hilfa891a4naebpp7c5bqt9q82/xebagimibinasiwivuteparep.pdfIn PDF document text
    • http://becucci.it/userfiles/files/bekinefogesixux.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b95acc0096b---12421936569.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4de672b9c3---24228055556.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/40371068529.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/88378469953.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/68234a5d95db235cec3ff92946f7e851/japixusivozifafijexo.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/38184543203.pdfIn PDF document text
    • http://www.moyekolodin.com/files/62448882604.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/jozezivonutoxevavorone.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=way+city+game+cheat+codesPDF link annotation
    • 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_off000106d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEB 10672 bytes
SHA-256: 4ee13828b2499f33969398a6564d9f4dd3370d9f387a04152ce526263464694d
font_02_sfnt_off00013746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13746 17744 bytes
SHA-256: 308c3f1a6a7bd5ed06507cc908602a8cbbf8e62994ba4a5ac698f47c8831b5b8