Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5bad9f7a595180e…

MALICIOUS

PDF

80.3 KB Created: 2021-08-28 21:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bc439ea4f23d2202f0afb1a6f982e838 SHA-1: d1b1e024cb0da7065a733af1a93c6c2ce8b1fe5a SHA-256: e5bad9f7a595180e2ca73f5f29e660d175cb938b9b056ce544aecc4e6e182c03
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF contains embedded JavaScript and numerous external URIs, many pointing to compromised or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://crewmak.ru/uplcv?utm_term=degree+of+lewdity+game PDF link annotation
    • https://dycmc.com/DATA/upload/files/202106131405453377.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202106/1623675122.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210606_230802.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/66ca480cfb0371ca506c712dc5036e9c/liperimavenelila.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/majalurutogimimuzabo.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/52105828016.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/84752454742.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079217a37f6f---33056122617.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/2a2f7803ddcdabb72fd8d116c7835a83/26713049165.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/resuvufanupusinabibit.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608201e088663---mulozitelumu.pdfIn PDF document text
    • https://drsaman.com/files/xivowitiru.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/mivixiduk.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/gudij.pdfIn PDF document text
    • https://equalitas.es/userfiles/file/zupedonilesosafuvizi.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/1097f012c0c0fb2a5227978a7288d22f/pofunebisuwowofovotekago.pdfIn PDF document text
    • https://businesslife.com/content/file/60680217486.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/ganakesewidexerazopunel.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608943df14153---16313057537.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202108/file/tisanojor.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/41801167848.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_off0000d872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD872 16844 bytes
SHA-256: 430f6a395c96eeccf8fdf9a9e7994cdc0b670bc54ceb5e170979c2059e211a35
font_01_sfnt_off000103c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C0 10628 bytes
SHA-256: 4a397ae9db60060d6ee4e95bae59b7f8ee787995120841285762aed9f81c545d
font_02_sfnt_off00011bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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