Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2149864925f4a0b…

MALICIOUS

PDF

79.6 KB Created: 2021-09-18 14:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6d72b2e21dcfd5b5d9b3b1f81ed37fe8 SHA-1: 13647a2573c53bf22e1df206be0086b81be5b990 SHA-256: b2149864925f4a0b547eb4787304b5536745a81dcc841c448b01a6c91cb95953
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 WordPress upload storage or disposable hosting. These elements suggest the document is designed to redirect users to malicious sites, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://irlanc.ru/uplcv?utm_term=mcpe+mod+packs+download PDF link annotation
    • http://maulich.vn/attachment/files/36208729592.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613510288d201---29995991927.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/21315990016.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/53613115971.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/hh2hedv3lnt8gkot9g9a6fe1ej/wobipune.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/70235468468.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/ziduboforimaposomo.pdfIn PDF document text
    • http://agavietnam.com/img/files/vemonejenosotutexar.pdfIn PDF document text
    • http://www.pilatesyoga.hr/files/files/84274243391.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/mizovezisejufigisud.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/sulonuladivimemewalejula.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/bobanow.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/xusovifokexubarozupo.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/53917552212.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/16890729639.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/72310703623.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/wafarorajekileb.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210916_032607.pdfIn PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/4572458729.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425d1f1a9ee---mofaz.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/76048545147.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee97f8b775---63899383181.pdfIn PDF document text
    • https://soechi.com/userfiles/file/ratux.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_off0000d3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF0 10556 bytes
SHA-256: 28b57a7311a430d244b99c19b50a0fd0c74e9dce645c55de412bf0b9eb3d98c4
font_02_sfnt_off00010410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10410 17168 bytes
SHA-256: 20c43e37e2c88ef9ba2380f910af1326bd88f0222ad70d0315230431dda4da38

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