Malicious PDF — malware analysis report

Static analysis result for SHA-256 143f1fa068f87e2a…

MALICIOUS

PDF

75.8 KB Created: 2021-09-12 04:37:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 587f3f2672a4161e9c52171258767615 SHA-1: 2cc26b7dded24b0a1eb875da4b25c8abe2418647 SHA-256: 143f1fa068f87e2ab476ef5f1fe6e71c4f8f1a16c1c606bd7d69896435c31c80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links pointing to potentially compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://aurorabersinar2.com/contents/files/99770790891.pdf In PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613175cecc535---lavale.pdfIn PDF document text
    • https://shidoremicrosys.com/media/kuxuvopixubagetimuxujon.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/bututor.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/57555284179.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/kipotavamuxalonivenato.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/bagoxasekew.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b06f1a184---vilulawaku.pdfIn PDF document text
    • https://moolans.com/uploads/files/89341511823.pdfIn PDF document text
    • http://samtekelektrik.com/files/jalimupezuvopepopada.pdfIn PDF document text
    • https://kakakmanis.com/contents/files/divirulojowidifofe.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/midabunorozekitof.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rajip.pdfIn PDF document text
    • http://traviet36.com/upload/files/zutalopuvovutaxesadogaxe.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/k35hpa2jo46qi659hg8qs3nh1g/37420494732.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210908052342.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613732c57d6a0---45367081754.pdfIn PDF document text
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/kesikopuzodaj.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/61342925b3577.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec6c21b387---pevasopivuvijovededosir.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/getateguwexota.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/84365852345.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=excell+ke+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC64B 17500 bytes
SHA-256: f0c885aa4dc5489379fcb2b5a6eee8b471d32e7398518151db64224be3bcb671
font_01_sfnt_off0000f38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA2 9944 bytes
SHA-256: b6ea48699d9ee1e00e2628250cd03909e2cc2e233e7f5fa3b193c9d298204912