Malicious PDF — malware analysis report

Static analysis result for SHA-256 53d633438a2e1464…

MALICIOUS

PDF

87.3 KB Created: 2021-09-19 22:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 25dca70aa717a3cac6e1bda1576ed25a SHA-1: e3f5ae3c3f2945395b002ded32458432e75d702f SHA-256: 53d633438a2e146435cddcb93b550a6274126c86ea073df2b859193ebde64206
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to other PDFs hosted on compromised websites. The primary purpose appears to be directing users to malicious content, likely for phishing or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://egyediajandekotletek.hu/mvc/userfiles/file/jatemusemevugiderewoki.pdf In PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/64400778410.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/ginaditekebimuboxilenuzak.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/90725384257.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/fefipunadakir.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/nogixexa.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/5997525732.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136ac2ef0393---44613864321.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/95574733035.pdfIn PDF document text
    • http://iscelenie.info/files/file/satosomazezegexidewakaw.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/89831898185.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613771f524d78---lixizapeve.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/92921342791.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367411f39aa---pedopidozanod.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16139b248d89b6---91795309723.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/pinedulabe.pdfIn PDF document text
    • http://www.satunatc.ac.th/ckfinder/userfiles/files/sekatorafopidirag.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/6909804532.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/gogalotarap.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/97631977089.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/jajaserasorufuvijaviragek.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/i1s5vvp7hkn9u68golfnob2u27/72184657838.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/nuzurozozugop.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/18434377971.pdfIn PDF document text
    • http://cascad-trans.ru/files/zixada.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=android+tablet+pc+manufacturersPDF 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_off0000ece0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F7 11000 bytes
SHA-256: 3d7d3c7790dd05ce885bc159778a7df3386525c2e5d0800b50b1dc26c2b4f65e
font_02_sfnt_off00011e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E45 18672 bytes
SHA-256: 617ec46e0b48319db6465e18fda0699dfe0ef14653f41d712ac7590494aec66a

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