Malicious PDF — malware analysis report

Static analysis result for SHA-256 10f9532ff614d65f…

MALICIOUS

PDF

86.9 KB Created: 2021-09-18 16:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 01e9656d8c936750b61ab9c41d1321a5 SHA-1: 5408eff91c0064a96d886e5c32ffd15ee38da3c3 SHA-256: 10f9532ff614d65fdfe46c9cf0aeea25ba354deb847b12aa5a3d30365e964a5b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The presence of multiple external URIs, including a link farm pointing to compromised WordPress uploads and disposable hosting, strongly suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://savvyais.com/userfiles/file/guxupijem.pdf In PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/80428401454.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/gabejedogadu.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/vogukilexemanoderitavaz.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/xafupusijexi.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/luposadomejor.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/70094862366.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/d16b60d7a03335326dfa60c2200f76f8/munenedeze.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/51094575470.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ebrgnndf1t0kji0r5fddg1mcr3/silojiza.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f75811d3f---25440329437.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db922aa88a---koxagizojetelute.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/jirimezogoju.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/22018989630.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/taxakusig.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/19938823462.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/94463933769.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/40216745851.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/xuvon.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/puxojor.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210915_F7FB9B218981E6B1.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/revimoxufadeneb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=best+app+for+pdf+editing+androidPDF 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_off0000f053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF053 10680 bytes
SHA-256: 791acbc27d180c37151ff889f0acad8b9ce8cc5377349c72a346e73e4fc8335e
font_01_sfnt_off000108c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D5 17664 bytes
SHA-256: e9cacf2ae92e73dc251502e5b9dc7c83c779b46ab961b44604e96475f6d26157

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