Malicious PDF — malware analysis report

Static analysis result for SHA-256 13e2719b9db47d02…

MALICIOUS

PDF

59.5 KB Created: 2021-10-03 15:38:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6a11e7e1afaa2e9466a57911d400397d SHA-1: e229d29dddeb6092e484042a4efd77358f77a4fa SHA-256: 13e2719b9db47d026d7bf044157037afd24b3858d0beb84e0d42dcc96c9b3906
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or are structured as link farms. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5257

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 http://zoldjogsi.hu/uploads/files/61012535263.pdf In PDF document text
    • http://oreade-breche.fr/userfiles/file/jogazatuwikesava.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b4987712c---77159356535.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/pimutupamabom.pdfIn PDF document text
    • http://advertisingreports.info/assets/ckfinder/core/connector/php/uploads/files/tawowusazuzura.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/wesikekitigugotokifuge.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136dc0c06167---pamifulujefemidoborezilu.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/soxexinekavagoru.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311e24e6d01---manogapux.pdfIn PDF document text
    • http://infinity-c-t.com/userfiles/file/45667240386.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/45779728270.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/zodufeme.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/59751164230.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/77118136409.pdfIn PDF document text
    • https://servauto.fr/img/user/file/bogunoxajonoze.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/75312308067.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/tipefev.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/33757440381.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/75695418306.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/83365266502.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/dutabela.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/parunafeno.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/desaxema.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/dusapodajimino.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/27057127736.pdfIn PDF document text
    • http://boardmark.com/files/file/71895282721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=prince+and+knight+pdf+freePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB9 19108 bytes
SHA-256: 525870c5d4c744a0f97cfd0ffe8312afb3bf73af6742a5ad50ae0849398bf9aa

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