Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c7d4b475c905377…

MALICIOUS

PDF

82.3 KB Created: 2021-08-31 21:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5732966adc4976c8c2fd382ce7727f38 SHA-1: 009b18bb80f998af0463242219c93fb43bd6339a SHA-256: 8c7d4b475c9053774ae330976871da98c297b833290e957541910126deb55bf5
164 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 and a large number of external links, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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
  • 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://ketchas.ru/uplcv?utm_term=area+and+perimeter+of+rectangles+worksheet+answers PDF link annotation
    • https://kuraniterbiye.com/resimler/files/meguzanitul.pdfIn PDF document text
    • https://le-luc-braslou.fr/images/file/16998348033.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1612989340c9bc---96239453618.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0f625c47c---zipemikizix.pdfIn PDF document text
    • https://carlojans.com/cms/file/40270219197.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/vevutizurabudu.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/82700837470.pdfIn PDF document text
    • http://debten.net/UserFiles/File/21284753876.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/7a506c93fd4e755db86ecd170fcf1086/43978668436.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/84428627140.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/31212553983.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078a88d374f8---88682981587.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/mifalelukopomotadusex.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/wubumobades.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/97c65db20ecf52648e724e2ba9b150f2/2485698170.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b43c52ece6e---74376441283.pdfIn PDF document text
    • http://pensacolahigh1964.com/clients/1/1d/1d652d7f5bd5fd2f3712913460b20393/File/55527603508.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/rafupejinirijebivoxujar.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/34op01lh806mtebnir6qtfb035/xeloladelutepatato.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/20518091146.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/94135732526.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/womijiribilugamirazuza.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/vevigoma.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/dakososevuwejexunoxi.pdfIn PDF document text
    • 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_off0000d853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD853 11224 bytes
SHA-256: e260ad84293c3e2652754a4378d6fe90632bdaaecf95e109a1ea3a76ca7995b3
font_01_sfnt_off0000f241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF241 18052 bytes
SHA-256: dd7ef36ebe6cde5e929d8249ebc3628287e105a66cbad0dfe5042e801761ca09
font_02_sfnt_off00012128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12128 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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