Malicious PDF — malware analysis report

Static analysis result for SHA-256 54908e680519b179…

MALICIOUS

PDF

65.1 KB Created: 2021-08-24 18:22:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 44c8d509def3a2eca71aa3f4a585dc29 SHA-1: 2b7fbb0b99d66d21bc9726fb516c871a314c25dd SHA-256: 54908e680519b179abae8495f975ddae1c45aa1403450f8153922c9035267b29
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple links pointing to disposable hosting, indicative of a link farm designed to distribute malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a phishing lure or a downloader for further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7123

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 http://ippon.lv/uploads/File/zalovadatijarugizo.pdf In PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/givubolotubosuzejigez.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/hh1nhgn0061cbe7f5ntrltljj6/mokusabenuxunotijufovum.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/79089c0c33758eea1340ad3222efc345/74050466888.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160837eb586f89---68591609561.pdfIn PDF document text
    • http://contelex.it/userfiles/files/wababotupenijapunufonev.pdfIn PDF document text
    • http://propellerclubsandiego.org/uploads/files/74141081881.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/mavev.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/3376617874.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/26378156069.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/zidinovuxaxipa.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/82685505462.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/fn2o5iunr50sibhsk19vckmcse/85795408916.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/wiwokapakew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=int+to+cstringPDF link annotation

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