Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2307f4d6f978404…

MALICIOUS

PDF

80.4 KB Created: 2021-09-14 01:30:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5efbe1adcdb8478e054beafdd8df62af SHA-1: 9fc7a271b969ea99ab592925d14faecdd74266bb SHA-256: c2307f4d6f978404f09f2760538d8c888b778e1cd1e3c9f06066ee184f7059f0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/1a9e37f2a6aa3602b052b83b071a0ee9/33443692548.pdf In PDF document text
    • http://www.centralperdana.com/file/20030853254.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/43542136346.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/pozezepuzididokubar.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/pepugusikomizov.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/c8a82aab971a4127d07859401d08454d/fekapuwugerinedutulu.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c61e314a0---675042049.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/28658025712.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/timibaxutasu.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/siziluvegupazejoxifinub.pdfIn PDF document text
    • http://sibstroiexp.ru/userfiles/file/pijuloguviwomovutara.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/zazaxe.pdfIn PDF document text
    • https://ekransamara.ru/files/xubosejepa.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613242f09bb97---kizenepixe.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/numobanitotidenolad.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/36932410658.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dab6f40af8---miwox.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/86320860991.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/24842035380.pdfIn PDF document text
    • http://edituj.cz/res/file/ditegoditubizax.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/55513890321.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134715bdb967---xerufeki.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/gidodoxajepopere.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=aerofly+fs+2020+apk+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD668 17116 bytes
SHA-256: 08c3ec32232ba86a36fd3c8f8b9ccde9296928b4e27e84f32c1c103386737f3f
font_01_sfnt_off000102b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC8 10816 bytes
SHA-256: 104dd9d0cf4605317953062568699575967fb1483a9e9bacc893e9d2b4886a1d

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