Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef364b1d92f4aae7…

MALICIOUS

PDF

81.1 KB Created: 2021-09-17 11:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5b2deb394c851d39c9b168347424a8ec SHA-1: 6608aa33150a00739aa78c2b7991e212483f14e2 SHA-256: ef364b1d92f4aae73128474612257068a13c12f22108e88bc0f1ff8861fb96d8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external URIs and link farm patterns, suggesting a phishing or malware distribution attempt. The embedded JavaScript stream, though not directly analyzed for specific actions, is a common vector for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://medvor.ru/uplcv?utm_term=builder+game+mod+apk PDF link annotation
    • https://laptoptranganh.com/data/dulieu/files/jodewirasamarusuvage.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/zenavag.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/3635452911.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/3363401643.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/20181627859.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/59371226471.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/sarelodepovaveduwabudigoz.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e7a58b805---58608819207.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sezosagosaxolifuju.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/53541e2becc09101e214615b11aa0091/44496111292.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/46942421699.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/sowiweloluzakezejuxazuxik.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614120e3615af---54928779745.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/lewodipisojonironatoso.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141e1e8f0d4f---judome.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/zunemigutonidelofum.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613913cf3f9a2---xutun.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/tomizaxonowilom.pdfIn PDF document text
    • https://yauspeshen.com/ckfinder/userfiles/files/kefogidituz.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/paridejafa.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/zawepunut.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/22803471026.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_off0000d99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99A 17588 bytes
SHA-256: 696ea6b0ce866d60cc7c624547aaee01fb60635fd793958b1ea340d8706a46ec
font_01_sfnt_off0001068f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA6 10608 bytes
SHA-256: 33f29d1afc791c055c6846ceddcf29edf15e9b18df77cd9574dc1bcd76885b4b

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