Malicious PDF — malware analysis report

Static analysis result for SHA-256 032551fd63889af3…

MALICIOUS

PDF

91.5 KB Created: 2021-07-31 07:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b63407d993fecca78de4c9fde027ebef SHA-1: 551bf8bafa67f98124a1edd627616e097ca26cfd SHA-256: 032551fd63889af361b582ec77474643dc7f5a4ecd6c48bec6fd6b21b83f4e27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, forming a link farm. The presence of these links suggests an attempt to lure users to potentially malicious sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://chandigarhdatarecovery.com/files/file/34933276399.pdf In PDF document text
    • http://asokmontridental.com/userfiles/file/vegisi.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/91901212338.pdfIn PDF document text
    • http://kistours.hu/userfiles/file/novutexupezorex.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc59376cb26---mavididedusapodusakozudoz.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/wovirujafuzujijat.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/21802963695.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fe6b1f67a---19054727269.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/48038894673.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/fikapa.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/36478591904.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089eb46c0eea---vigigalipijiganaluto.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/ce3a0a49188dd5348db7d335d9a49178/baritubakuregafigijel.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1073be7da---33020289917.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/26253508869.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/3c9d56d7bdecff979d914660548adc42/28556154536.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f3d61bd539f---79893643439.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/60659519325.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/favoponilisifejuwafisu.pdfIn PDF document text
    • http://espicycooking.com/files/file///vaxariruzujodowagiri.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/gomovasusiselajanijetam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=taking+cara+babies+summaryPDF 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_off00010034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10034 17520 bytes
SHA-256: 9a66804f17f42936d84062c25cbc821a5a7c570ead6d580f5afdd452db38168a
font_01_sfnt_off00012de6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE6 10720 bytes
SHA-256: b5bad3101f122ff389e983b4f0932fa9c186e60ff916251b5618a3840629aebb
font_02_sfnt_off00014690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14690 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1