Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1bb3289e4c7bfaa…

MALICIOUS

PDF

72.9 KB Created: 2021-09-19 21:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5b1bdca7b97d633099b31a3c85cbcf1b SHA-1: d12242e14bad35bc66306466959e4d0099718c17 SHA-256: c1bb3289e4c7bfaa92533d4a0733fac01e59ee39dcf50a7777900cd84723cb17
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 URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=spoofing+pokemon+go+2021 PDF link annotation
    • http://tucsokszekszard.hu/images/news/file/karijatepopatoti.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87311776716.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/54949097444.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146008a3808c---60295511158.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/pezekatadozonowebo.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/88686743110.pdfIn PDF document text
    • http://iranjobex.com/cache/fck_files/file/97747320954.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/monofupivotubexogiwuxej.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16141e351913b2---46275834222.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109090349539535.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/bolajafafenufekorazukowef.pdfIn PDF document text
    • https://unosms.us/userfiles/file/50511937702.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/89740531709.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/vagevegimisuximizokifiju.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/46db2ed3fdd9413d73d76e10bfb3af23/94797029705.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/70983513380.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sazepopuwatozu.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/2669778839.pdfIn PDF document text
    • https://synersys.fr/contenu/file/28424074803.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/mb5jrbnjg4s2hka26lnoubbdcl/lowib.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/93767443036.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/lojoru.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/gaxopijodidazewekuda.pdfIn PDF document text
    • http://dd-eng.com/files/files/27154868097.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_off0000b965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB965 17032 bytes
SHA-256: 25860deab8a4f9584b55128c6dc02d89d475f7245875ed4b08fcc582856249e7
font_01_sfnt_off0000e55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD72 10588 bytes
SHA-256: ab59837afdff8b47e533f9a618e3668746256170ac5e0eff9249178600ee8b35

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