Malicious PDF — malware analysis report

Static analysis result for SHA-256 8197129864181f04…

MALICIOUS

PDF

58.6 KB Created: 2021-05-26 07:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c250c3aa50bb9fa7568b24e2e633735d SHA-1: 4b03ccba9d929643aba770cb2370ed738daad19b SHA-256: 8197129864181f042e4d86f3994d4f6ecaaec4977c87b5cf88e68da26a6078c4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms, suggesting a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8773

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nomylo.ru/uplcv?utm_term=recetas+de+comida+tradicional+mexicana+pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1607d37afd00b8---nukolus.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072252ff2dbb---venoras.pdf
    • https://tenfci.org/userfiles/file/rojovolazamewusit.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/67da71cakst0tg84kugol8hhtn/xixusalobomekamuxulezu.pdf
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/86fa85ac7a89ed24e9fb60eb94b6aaa0/suxewejuporezupozuxil.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a345f72b5ef---77380217268.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/42640199ecd9ae5066bac754d3488b69/wozudoruseravod.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/ldbq1klk9e2prr51s6o9f77mhh/vuxudoxuzigatevijigojaf.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984b7691723---vamox.pdf
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607496fb25e97---66256536514.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609edb2e6d8e5---pafub.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077636b95440---41616876168.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/d7d1a1396812e96196ffe4679e84665e/2218073265.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609767356371c---41520469411.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f284184c4---likaxaremevurube.pdf
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/7310513dc28c17d391b3e2d6047451a1/41434566602.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d83e.bin
a1b67cbdc91bb9566d9157e155b2c81e8df782bf993104348318ed45f118593e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD83E 5376 bytes

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