Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8ac052b22509b20…

MALICIOUS

PDF

66.5 KB Created: 2021-07-24 22:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 598fd7ec4a39676672afe648d7376e34 SHA-1: 1500f52efe2618b9fb8c9e147e279b36997d51e2 SHA-256: d8ac052b22509b20b7f4bfbaaa613a4ae638d6cdfb09e708f8d7a605018b51c3
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, the document features a link farm pointing to multiple PDF files hosted on compromised WordPress sites, suggesting an attempt to distribute further malicious content or conduct phishing. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8190

Heuristics 6

  • 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.
  • 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://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/5acbec5a84df1794a5ba8863145e1d20/47848848199.pdf In PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160727ee674799---53732443808.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/subevovebemokebepodinola.pdfIn PDF document text
    • http://skomi.ru/img/files/file/mamezirifim.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/dntjlbq4the1c1tb6ihtoj79m5/71208082780.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c282e560ef9---pesenelazukegadodano.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/66625137709.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160fc157f96898---52208918036.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/kulivuxosizibafikapuwa.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16097d87b4b9fb---jekexipivogomivedi.pdfIn PDF document text
    • https://jslt.site/js/ckfinder/userfiles/files/50404603080.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/56129728934.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16074ca417cdcd---vavipisajezis.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/7780661445.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c2bd77447---misusoresudefigepozuten.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/lenuxivojite.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff0fa17b59---81606424994.pdfIn PDF document text
    • https://wagaskar.com/media/xusopepikosoxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=redhouse+almanca+resimli+s%C3%B6zl%C3%BCk+pdfPDF link annotation

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