Malicious PDF — malware analysis report

Static analysis result for SHA-256 11cd2f1dea172f15…

MALICIOUS

PDF

70.8 KB Created: 2021-09-13 22:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f521bdb48e3d947258db608f262cb135 SHA-1: 84fe967c866f40e56ce995b35e3087d9dd56982c SHA-256: 11cd2f1dea172f158472868c212ca1fc86478d2890ce8c7b04791918be137aeb
164 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream, a common technique for executing malicious code within documents. This script likely redirects the user to external URLs, as indicated by the numerous PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://theorientgarden.iorderfoods.com/uploads/files/bepixajeke.pdf In PDF document text
    • http://ngnjl.com/userfiles/files/xarimu.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/48493581543.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/hijnj157eqahj1v4bsv92sln2k/sobatopiw.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/73776912222.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/gidiketolixodadalaru.pdfIn PDF document text
    • http://live-net.it/file/wenowiwalodinelegizalugaj.pdfIn PDF document text
    • https://ksboutlet.com/file/files/jutubulejobepebibujife.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/wegag.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/relitexikotepamojebom.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/63195139005.pdfIn PDF document text
    • https://duongthuy.net/userfiles/file/wilifibipuxupeneravitaxi.pdfIn PDF document text
    • http://denetimmusavirlik.com/userfiles/file/25370425041.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/56403949288.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/a4ssnas0rchbe5jvbloild6cq7/56386990114.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/99115779317.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/99413329590.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/zapawirojavesawowal.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/95151402849.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/80994371603.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/01b87a4963c01fd93f15fd8daa50df2a/34814084108.pdfIn PDF document text
    • https://datajournonepal.org/files/gozotomaja.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/sotifidix.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/73917443561.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=we+are+your+friends+full+movie+onlinePDF 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_off0000b5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE10 10688 bytes
SHA-256: 74b7338c73fabccf6c442e0948e86fb7a5cd051ea8263719e9ac61f5b840bc3c
font_02_sfnt_off0000e68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68A 15664 bytes
SHA-256: 4b6bc53a1fdc9a938f7037f99e7be7bacec14435c7c02593114287d54e1fd285

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