Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bc6bb95d9520687…

MALICIOUS

PDF

81.5 KB Created: 2021-09-07 05:15:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9db2df7deb6bbd220ec5ea0b9ba95361 SHA-1: 46853144d1f2a9a9993600ab51608ef6fc6247a2 SHA-256: 4bc6bb95d9520687a00f265f9da53b496ee00e1b3a000b0329577fbacc213f93
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to various websites, some of which are hosted on compromised WordPress installations. The presence of 'utm_term' parameters in some URLs suggests a phishing or SEO-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://synerhu.ru/uplcv?utm_term=sepsis+pdf+qsofa PDF link annotation
    • http://josephlillianmorrisfamily.com/clients/59960/File/mobeponuteponibo.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd11bb0ed2---jejafudag.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/murivukipewo.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/29761388550.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/zanesepemevuwapepugute.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/88211851443.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/ef8e01d5c6088c0921d0ba31ad4de513/viteloburatajigub.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/lapaperedefuridon.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/73288087887.pdfIn PDF document text
    • http://strandedtattoo.net/file/80954530816.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///xabuterulimobonekeliriba.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/98732306901.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/41464453495.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/25044888554.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/kemetevagapopose.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/26358627250.pdfIn PDF document text
    • http://jonme.net/ckupload/files/50203921859.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/69578107720.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/cqqvrfhi1m1ttsc84b9hphfp94/teludotosijimekulo.pdfIn PDF document text
    • https://airtelco.com/data/users/_/email/files/sekimafopisax.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a8641ce149a---jafisuvusafen.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6ca6b4825---94817461607.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/738615654115cc591a49561103fc3e1e/puwobexivadikefupujufe.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e51044820---varerodas.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_off0000d7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EC 10364 bytes
SHA-256: 1b272b719f58864abef411f523cb781133c1ed105e7df0f32ab90940e70cf10f
font_01_sfnt_off0000ef2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2D 19024 bytes
SHA-256: 9142b7f175305354e5da090add3aa4752b57526006bf6dbc0ffb65be3efd7d7f
font_02_sfnt_off00012103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12103 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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