Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9107caa7d62777e…

MALICIOUS

PDF

77.5 KB Created: 2021-08-11 04:45:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e9d861aec34204de4bbf0fe810414aad SHA-1: ebea8d60bae5a8625ebc351d295e75114e597ee9 SHA-256: f9107caa7d62777e059e29303292f3896b15b78f90bb493af9407710f43db668
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 with high confidence. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lead the user to a potentially harmful site, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://medvor.ru/uplcv?utm_term=stanley+fatmax+450+jump+starter+manual PDF link annotation
    • https://nacionalequipamentos.com/ckeditor/uploads/files/57084617072.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/3v9b7ll5ne63oo5r2770t5poi0/24261654188.pdfIn PDF document text
    • http://xn--om2b25zm6igqb.com/ckupload/files/12078139683.pdfIn PDF document text
    • http://onlineexpert.in/userfiles/file/77083633343.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107f8ac53d88---raxawetomakozawipegotimu.pdfIn PDF document text
    • http://hawks79.com/clients/85064/File/81859032180.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/kojekirolifololugi.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/vebufesosekeropimale.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/gebesu.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/18076544861.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/90780476151.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/614e2b899f9e09936e5bf079afd2447e/ratofozobodivexiwasupeb.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/45320673317.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/d277cee74627343be17802dee5497577/14943371641.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4475a964c---latokojubasozujovixiwige.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/getisamenegavowaribid.pdfIn PDF document text
    • http://recrute.fr/files/files/55426517008.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/1b0b59de9beba8bf236d5016d0453092/56122345825.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/jedita.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/eu1tj1clb3m1vqtfgnpa31eaah/94120535355.pdfIn PDF document text
    • http://ud2-140.com/files/14304315200.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609879eaa0984---mobekobumeteja.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16080f40024f23---35048953806.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/cb8f7f4f9d4a9f0e90e6c2e5a383d105/kasezelinosekodogamedu.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/zefajapapuvupuvoboxukuf.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/fd18f94284bf8d9898cb63ea7af8cb7b/99670460480.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/jaduwisavukogegiba.pdfIn PDF document text
    • 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_off0000c8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E3 16296 bytes
SHA-256: ba98cda2bc9041f40aa0207bd3f2e1162b5c6e10a96f53e281a568736d151dcf
font_02_sfnt_off00010b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B23 11164 bytes
SHA-256: ed0a17960d9760dc61f68b089536ff326448f5daf8a8e102a2bf40184284f037

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