Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f0bcc993dcec6e8…

MALICIOUS

PDF

48.0 KB Created: 2021-09-08 03:38:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a7b62bec2f405098ac61fd326a6b268a SHA-1: ab5c080c5a2b038e1d85738a1a0bfb957cbbfc8d SHA-256: 1f0bcc993dcec6e87e558db3a3ae50f10b92153b6e09fc160f504d378c30f1d1
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The file also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to obscure the final malicious destination. The presence of embedded JavaScript and the link farm structure indicate a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9210

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://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/9a1691115f460921e3aca2262b978969/25817681249.pdf In PDF document text
    • https://vieclamxaydung24h.com/upload/files/82421634491.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608eeb9c64cf6---28562947479.pdfIn PDF document text
    • https://codecs.ro/images/file/46625659269.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/6cb05a106f1e12f986f908cc4aaec1db/5576867569.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/rikadesezebevakifasedaki.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/piligogifomup.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/jr80pl67s4nqvtl5l855gbkb70/43446179458.pdfIn PDF document text
    • http://fpole.ru/sadm_files/jimerutobujoweg.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/12862750485.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/galabogemavaxufipifedi.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/18440040317.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/pekalagijak.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092475443afe---98046004694.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/6b38de92667375c0b9dedbfe4d8d77e6/74109446017.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///zebetomawosumunoreroroguj.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609eeb221834d---82648427914.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/degazofupejodanuna.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609905437214b---pojefef.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/dutubifamopiperebefudulo.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/urh9l14eoqrstofu9kom8kge7e/lokegejipibipilan.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/e2b7c0e511d317410133ea28f63cad38/99006364771.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=topographical+anatomy+and+operative+surgery+pdfPDF link annotation

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