Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d5124039ee62965…

MALICIOUS

PDF

64.0 KB Created: 2021-09-18 22:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 0b39fb943d38796e4356d2076e538d78 SHA-1: d58eb1a7c1e4fe265f5aef7a3f338583fa070ab0 SHA-256: 4d5124039ee62965d64a6376a69aba8edb23435fc10263b3497e3b3c6eca6310
172 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and multiple external URIs, indicating it is designed to redirect users to malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'SE_LOLBIN_RUN_COMMAND' suggest a deliberate attempt to create a link farm for SEO manipulation or to host malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further confirms its malicious nature, likely serving as a phishing lure or a downloader for further payloads.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2894

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://krisoc.ru/uplcv?utm_term=solving+problems+in+fluid+mechanics+volume+1+pdf PDF link annotation
    • http://adirondackseafood.com/ckfinder/userfiles/files/61518357006.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/d099aa79f873a73b1b4847837d5d323d/38291090687.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/dukufasegexibepebok.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/kivefivurikagupop.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/70012415289.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/52524422207.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311812ef813---61602076063.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210905_51F9CA2438ECB228.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/21290012397.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/42624972381.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/debesosolegukirerozo.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/roruxinotepexijanozonum.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/powulixawegowosutixuzugi.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/5b44f9ac3b11f683e495c458423551f7/85953929737.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/kalar.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/18827286366.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/zabumariviparogutiw.pdfIn PDF document text
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/padezafin.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/sejazixogarajevopezujat.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/bovuvodesetubefeza.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/fimikixibobopib.pdfIn macro / runtime command snippet
    • http://bodemveenweiden.nl/bodem-veenweiden-img/pakuwoginotolifilufo.pdfIn PDF document text
    • http://ridendo.cz/files/file/jasuzuninedalasibi.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/49426993468.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145313157dfa---pinonebudonubofubotubavik.pdfIn PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/kimekonejoxefugisov.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/83891113364.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC306 11404 bytes
SHA-256: 5859860090cb803d276e3e3a8eb8c386b3a2594af72f142bd76ffd4c19f1afdf
font_01_sfnt_off0000dd53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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