Malicious PDF — malware analysis report

Static analysis result for SHA-256 23fb105ea40e5e37…

MALICIOUS

PDF

198.4 KB Created: 2021-08-03 03:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7650cdea83c44e58750b468dce1e02d2 SHA-1: 90598391d33ae812affdad486fe3e406cdbfbc6c SHA-256: 23fb105ea40e5e373b69c3aeda95b4194888dd595800768e2e6401c752b29f77
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded links, with several pointing to compromised WordPress upload directories, suggesting a phishing or credential harvesting attempt. While no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

Heuristics 5

  • 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.
  • 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 http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/536213505.pdf In PDF document text
    • http://palenice.net/obrazky_clanky/file/55054685391.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec2e9511e5---21499003150.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aff53869180---53660096520.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/fidenuba.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/kusaxozikafafizajovomuj.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/sidakupijefe.pdfIn PDF document text
    • https://actor-conseil.com/files/file/lusilokuxibu.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/dfpc0lip1l9q2h7cqb76ki7pm5/47887135669.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/4147570414.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/97463915573.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/e83cb2ef492e5da428f2eec0a833b0cb/rokakuzune.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/76339674031.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/pafusoguvife.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/80f9b9229685d79699ae674a9e1242de/mimakasanonapub.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/37389344074.pdfIn PDF document text
    • https://primer-spb.ru/files/files/20094411798.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/nobexara.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091ed9a2def5---12522566980.pdfIn PDF document text
    • https://infotechbg.eu/file/36685786860.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c64a0275a6---najemufoxusirubuganodig.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/gumufi.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/luxedokuzinopozad.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/e9e874e5f8fd8b818f64ca694a9cbe5c/22122713776.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=oraciones+impersonales+ejemplos+en+reglamentosPDF 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_off0002a068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A068 21724 bytes
SHA-256: 5a2f2a65b87e1a6f7f424b22716df616a827d74ac8039155c8779b8e3cad105b
font_01_sfnt_off0002d824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D824 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002f03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F03B 10872 bytes
SHA-256: 698a69c5b21aa04b1a19c0a544f67e4372bb42d5a71a3210454c0af4d1cd1a3a