Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b9eaa48078d8681…

MALICIOUS

PDF

113.7 KB Created: 2021-09-16 15:34:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f1aa36ad9b03d9e509aa40ce97fb2942 SHA-1: 495260d9f280d45863a26940fb57cce2381693b3 SHA-256: 9b9eaa48078d868136b63922111317dc8390f192bf8daaa00eadf06ec95e3e56
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external links, some pointing to compromised WordPress sites, suggesting it's designed to redirect users to malicious content or phishing pages. The presence of JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8122

Heuristics 6

  • 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.
  • 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://loctra.net/userfiles/file/38367914387.pdf In PDF document text
    • http://proxima-online.it/public/file/jisuvotef.pdfIn PDF document text
    • https://wrd13.com/force/file/53747853828.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/xijodiraputufowisod.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/votosapodejepuvilusi.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/59914873244.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405985bc6a2---bosanexijabadezepazula.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/7291577218.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/memuvovoxixotubuzo.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/54946188760.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/folate.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/vexinusaxalavesak.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16141c31534078---60467529248.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/gidogelokobun.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/29291534344.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/84019818237.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/95496293648.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/31991327164.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/4981876512.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/faluvitefepedasamiduva.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd5e841d81---taravene.pdfIn PDF document text
    • http://irths.com/upload_files/files/91609896746.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/legurakigaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=starship+troopers+robert+heinlein+pdfPDF 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_off00019124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19124 19092 bytes
SHA-256: c1236cd9cf0146f31e3ddf4f32dfe08bd13c9e7a0e3aa5952deeab99906e66c8

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