Malicious PDF — malware analysis report

Static analysis result for SHA-256 17eef8ad461802ee…

MALICIOUS

PDF

91.5 KB Created: 2021-09-05 14:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7ecda0cf37cf9762b55a096332522b08 SHA-1: b4d2c9ac024a376495da9b81de1ca0eaa5c89d2f SHA-256: 17eef8ad461802ee622295ef41dc583454402280ce811fca8dcda5d94261d48c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains a link farm pointing to numerous PDF files hosted on various domains, many of which appear to be compromised WordPress sites. The presence of multiple external URIs and link farm heuristics suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://allmassage.net/upload/file/20210716221837.pdf In PDF document text
    • https://cheesykeju.com/contents/files/sivurepafi.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5e5670137b---79647649939.pdfIn PDF document text
    • https://signika.pl/Upload/file/vewesukilasat.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/fdebd30caa82f5b39c14200801896e19/bupudorazabopotad.pdfIn PDF document text
    • http://sartor.ru/upload/files/6796721359.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/sewaziganawafobano.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/500e4c996127c8c7e9ed9109fbb9cfc0/6544182619.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/60716722662.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/vapugapip.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/34726859091.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///dixisawuwenajanedima.pdfIn PDF document text
    • http://tipiland.net/upload/file/butaxuruno.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/8fe04716fc90f8ce84a2129e36d76ac9/ziloxagidofafiwafisemej.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8bf2a01e8---1536509976.pdfIn PDF document text
    • http://01host.ru/userfiles/files/tanumifosukukutulezuziwo.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160896a8775b2b---nokenozufipipobirok.pdfIn PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/nenasonubuwuvukanada.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c04da7f1ff6---38112943160.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608265145d764---popaxopusalujikonem.pdfIn PDF document text
    • https://starbox.fr/img/files/sufifekajiwusexigig.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55be41f43b---jamili.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=babcock+and+wilcox+boiler+pdf+downloadPDF 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_off0000fd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD75 10820 bytes
SHA-256: 9bb44d41b2ac905049a103139efef3471f65b9fb5bc46e0bcb14e7207bcaeefe
font_01_sfnt_off00011664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11664 19064 bytes
SHA-256: 7149501def6b255c06a96c37d1cbee0e423881415d3dfac31cd7f39b1ffeb08e
font_02_sfnt_off00014859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14859 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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