Malicious PDF — malware analysis report

Static analysis result for SHA-256 17e82a8d55622852…

MALICIOUS

PDF

68.3 KB Created: 2021-10-01 03:24:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6aec59cb2d6ac67d5d8359ad5c99e4cc SHA-1: 1f62dac480bc251be614899d20da66f3f0b310b9 SHA-256: 17e82a8d556228526263de4335ec29f08e4d707b8464eaf7f8f989a934454580
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such documents to create link farms, likely for SEO manipulation or to host phishing lures. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent. While no scripts were explicitly extracted, the nature of the embedded links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5668

Heuristics 5

  • 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
  • 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://crysiq.ru/uplcv?utm_term=best+photo+editing+software+for+windows+10+64+bit+free+download PDF link annotation
    • http://grgct.com/ckfinder/userfiles/files/74338815213.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/jolukorawo.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16139cb6c9ac1a---55670069694.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc05c4c06b---tamivebusimafopineve.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/ranakopupivivedexawem.pdfIn PDF document text
    • http://paliukenas.lt/i/File/mevonopiwibida.pdfIn PDF document text
    • http://mcrlclient.gilcom.ro/ckfinder/userfiles/files/68059691350.pdfIn PDF document text
    • http://ciatic.saintelserver.com/archivos_editor/file/lokutesivagoman.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/f05fe6bce5489d3023a53d824110aec1/gilov.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/42358924144.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/46089148562.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/27475693105.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109121751063083.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/kesef.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/87694127695.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/kesapaxamefunanojaliket.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/rifefomubope.pdfIn PDF document text
    • https://alibaba-cave.com/userfiles/file/jijelibe.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1615141ec00d73---sarumagabamurotuwufutakos.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613834b9271a7---nikawazupujir.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/tafukegiguxolekedazoz.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140e7eeb179a---diretomajonugopase.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_off0000bbea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBEA 11476 bytes
SHA-256: f7c41c8b78a4ccf9f9ed004a2adcc32c6386bb4f6e987c1db225bc9ebd2eb8f7
font_01_sfnt_off0000d6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C2 18596 bytes
SHA-256: 019e5236a1703bd091cfad75644cb1255babdd349f1aa235b233236c51c762e8

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