Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f81da8b1df5b51e…

MALICIOUS

PDF

74.1 KB Created: 2021-09-06 21:30:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5cb62c6b13186f9a904c56fc5f8b5429 SHA-1: c756c9b93a6be16939d3e23bcd62af4ce4c92e1f SHA-256: 9f81da8b1df5b51e153aa09685c88c601ae6523274b76abe405519f574da20f4
156 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm hosted on compromised WordPress sites, designed to direct users to other malicious PDFs. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary attack pattern involves directing users to potentially malicious content via these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/c4aad54d36916534629f348ee8628485/nizurevabo.pdf In PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d8b2c4dc5---14932936539.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/42490555073.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/na720j0mm117qcl0frtbk90bt6/pofigididudizidob.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/4648587925.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160953b3e0fe51---kuwesabawofeto.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/171685a4323c0834b5ad866fe765e2fe/pimobafenofinuv.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/rutinudasuxamowu.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/84168316225.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/27426534938.pdfIn PDF document text
    • http://inglewood1968.com/clients/68690/File/xugoluzazizekozojujisow.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fd31553c6---solarepexukutane.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/aa3c54ded306a63279bd3f4b32f0e8e8/getimerofasunus.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/22637180837.pdfIn PDF document text
    • http://myredm.ru/uploads/file/ranumowaniluxem.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/kodosuninajojimeberag.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/pifitewabazat.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c03a4c25b4c---leripefutijas.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/64449629814.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f235d499e7c---zodop.pdfIn PDF document text
    • http://medicom.pl/userfiles/file/sedufedufuvisolakin.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/84527483794.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=maestria+robert+greene+pdf+descargarPDF 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_off0000be34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE34 10880 bytes
SHA-256: 1881a3827bd4518eb58c208c0fc5ea65e622590de8fe7de8869431b9eec955cc
font_01_sfnt_off0000d717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD717 16916 bytes
SHA-256: 983f0de2ddf9d069d6d42279a80051fc6fc52d73b567583c902e0136f395e852
font_02_sfnt_off000102ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.