Malicious PDF — malware analysis report

Static analysis result for SHA-256 20c0ce2b36dddc37…

MALICIOUS

PDF

81.7 KB Created: 2021-09-10 20:38:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 65901fe1f3273d979f49785e30de02e9 SHA-1: a5d10c69efa6cb2e4d14f225efcf1097d706effd SHA-256: 20c0ce2b36dddc37c7dd48ff5b12d13351dad9b8a3bbd7b236fae6e2ff8974ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. Heuristics indicate it functions as a link farm, directing users to compromised CMS uploads and disposable hosting sites. The embedded URLs and the PDF structure suggest an attempt to redirect users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://alley.52886.tw/uploads/files/sepufavisutetip.pdf In PDF document text
    • https://cncunse.com/d/files/67806651765.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/jonepivixowavapikigix.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/84655456339.pdfIn PDF document text
    • http://flirdining.com/uploads/files/964411549.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/zifegubokakaxobaxedok.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/jukijixekabawirorusowim.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109050649173330.pdfIn PDF document text
    • http://landia-print.com/pdir/file/parotigoziku.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138f7625eb2f---63608354340.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/vulavunurokibeboj.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/powuramolidorerezinerugab.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16131cfa024c0d---fepijofuxanat.pdfIn PDF document text
    • https://clickbox.ro/images/file/91276607573.pdfIn PDF document text
    • http://tfforming.ru/d/files/dogavovuworadevoj.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/d466753fb78571e08f53b1ac6b115e47/97245030618.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/bexejimikejevowa.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/47505565113.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/25c6725aceb39990261b50106380ae9f/60710914508.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ccbbd30f2---41078731882.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/87656556679.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=android+firmware+backupPDF 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_off0000dbbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBB 10868 bytes
SHA-256: 05d08e826582245b17a554c2f306fc7f94e86478df4e4a0b1cc262e58a49c887
font_01_sfnt_off0000f4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB9 17308 bytes
SHA-256: 6fdf15c688c9c2af451c1d26e757e8c75c28e9b2267932b10dc139f6c5bd641c