Malicious PDF — malware analysis report

Static analysis result for SHA-256 9396b0bf93e7e332…

MALICIOUS

PDF

75.0 KB Created: 2021-09-06 04:33:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5bfd16b29c34cc5ee4927d905b9268ef SHA-1: 83840afa88f79904c54dfbec13a88d91e79c36d3 SHA-256: 9396b0bf93e7e332ddb01503522503f9bcb6c9bf532c7b262f5320d16f8181a3
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm pointing to numerous PDF files hosted on compromised websites, suggesting an attempt to manipulate search engine results or distribute further malicious content. The presence of multiple external URIs and link farm heuristics indicates a coordinated effort to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161257c97e7e20---fuxol.pdf In PDF document text
    • http://abwrichmond.com/uploads/files/68971254465.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/tujisofe.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/17685525715.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/kibirawavugopunomo.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/65a50c1b4e4511f1f3f3eff2fe12f582/kovobe.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/68746539966.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/3aodnvuudrlg0hma11p53t02e1/radejipewuzajabafomutul.pdfIn PDF document text
    • http://webatnet.de/ckfinder/userfiles/files/wexexug.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16087ff2e2daf2---96420300876.pdfIn PDF document text
    • http://ty-int.com/files/files/vukavegokos.pdfIn PDF document text
    • https://camelcarpet.org/d/files/basupazenop.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/db0b66216ceefb9c00db091cf98e6f35/junezewefared.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/64fcee0567ac1e34c1eeddee295c6ab4/84646706142.pdfIn PDF document text
    • https://dolcezzecaffe.it/file/nesipipovivivefonuvov.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901383c43e4---60221134081.pdfIn PDF document text
    • http://longearedhounds.com/clients/65743/File/71176912497.pdfIn PDF document text
    • http://www.optimizecost.com/admin/ficheros_fckedit_subidos/zunap.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888eca2959b---83392586192.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/walujimonapo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=drager+alcotest+7410+printer+manualPDF 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_off0000bd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD2D 18580 bytes
SHA-256: 7c54f2241add158bbfbd2425d5a527795b17f1431008d3bcf9aa17fc39432a2d
font_01_sfnt_off0000ecb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CB 11120 bytes
SHA-256: 3cf1ee0e6bec339c237e5dfaf6918ba963e49f2a30569dffec54d2befbfeef72