Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce4bd2144d90fecd…

MALICIOUS

PDF

91.1 KB Created: 2021-09-05 03:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ce31b076e3d2a3f1ace75c349972c334 SHA-1: 8087f2d8460aaab3ee948d0d9c10c2a4eb4d787d SHA-256: ce4bd2144d90fecdb76e2f9a046662830f2748dddd4251c43a45c41ca82d5b95
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to multiple compromised WordPress upload directories and other domains, likely for phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a non-clustered link farm on disposable hosting, further supporting its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://asfalon.com/__files/file/mufejuxevusovadirofedu.pdf In PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16104ea0277e0f---duritex.pdfIn PDF document text
    • https://wittnebel.dk/file/lememubevimutan.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/49627529319.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160b3db7fa0d74---46741820522.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a433483ba4f---xazifusabulupewuposef.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c429591856---panirilarudoto.pdfIn PDF document text
    • http://araonline.hu/uploads/file/benajoza.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles//imagenes/37274457059.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4e76af7ac---kasexekulabok.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/62735098008.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad95c681bb---pexekufezisem.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/575b2798f281b14ca1d64a25e2a6f122/jekunubajivureminex.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/89692919694.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/ferexa.pdfIn PDF document text
    • http://moawin.org/editorfiles/userfiles/files/wubiko.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/xigapagiligejez.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1612b66fa9737d---25804237972.pdfIn PDF document text
    • http://bjjiffy.com/upload/lawokoto.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/85598514651.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/povodededu.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/foduretefokojajib.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/32378860120.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/86080351194.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=factores+biopsicosociales+pdfPDF 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_off0000fb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB39 19700 bytes
SHA-256: 737738326d9a4d621c0a75dc1d93947c59cea8958b3febe50f35b136789d8fbe
font_01_sfnt_off00012e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14689 10628 bytes
SHA-256: e8249214af18e1b90bf1f6d72be3c45b5549852f70fa9cb9173d099463947846

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