Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9e023e5d583365…

MALICIOUS

PDF

81.6 KB Created: 2021-09-04 17:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cbba0adf7ade4914b9991b6767896d43 SHA-1: 6a1ff57aa23457e64776de20743ddaf0017d2e97 SHA-256: 8c9e023e5d58336593833a52b0011d15da1834f30856f869ba3ca65b8a56fb0f
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded URLs and the nature of the heuristics indicate an attempt to exploit users by directing them to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://roweryelectra.eu/app/webroot/uploads/file/16199482471126.pdf In PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/76864c2ef3e637d36095a9ae9c20de90/49876094386.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607463cc5d3de---38999649130.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/munopofojulemu.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021516211226579.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/8affa6896d5baefb6c17bc3ecce2b5d4/vufidef.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/57c6aad354991daa5fc36ecb0677fcfd/78903329563.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/vibepikirojaxiji.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/37174871237.pdfIn PDF document text
    • http://namlongprojects.com/images/uploads/files/vugolaxakakepakuxa.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/bapidof.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/98351195832.pdfIn PDF document text
    • https://koratspring.com/upload/file/sipegisidosivijegununaw.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/zarebogalado.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/sisawiforesibojulijinukuk.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/027e4ce128650a0af88c539e2f3c3b3b/80296096684.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2038d9b8b---95481987410.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/35218701971.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3ac77e461---gomeludofibe.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/a4b141ba63f3afa4ce4b89f68f77deef/90203666031.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/jexamebefoto.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/h3ems106dkl615db2nu9s2463n/16126273200.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c300525e28---nufowopaxo.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/degimelubewa.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/77953263012.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/d6ibt4rba8tsge7bhimktpdcj6/13961093006.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/c1201070a991a3778ecaae30c7ef915c/babanubuku.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/wegodaburudifik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=split+pdfs+into+individual+pagesPDF 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_off0000dbd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD5 17020 bytes
SHA-256: 05626cc3227617ec22a36ba477cc6d84cd3e4e21b87898695623381ee6688820
font_01_sfnt_off00010770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10770 10812 bytes
SHA-256: c683a1b792ac09b191038e68d358d09f7628f5b1b77c0c9a4e7604b8a24e2cf9
font_02_sfnt_off00012053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12053 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1