Malicious PDF — malware analysis report

Static analysis result for SHA-256 624614100b390581…

MALICIOUS

PDF

82.1 KB Created: 2021-08-11 18:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: df494ad1972e8806007fa27fe147d14c SHA-1: eb86f5869e4f90c97357d73d16648f1db1b75b07 SHA-256: 624614100b39058159a44c7b1206d7f6011ee72623032c3fdb6180ecbb8c5829
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. It also features a link farm pointing to multiple compromised CMS upload locations and disposable hosting, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://smidgel.ru/uplcv?utm_term=jhene+aiko+sativa+download+mp3 PDF link annotation
    • https://triptoboloyfoundation.org/editorsfiles/files/31665694856.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/39982233519.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16079e67e7edc4---33997223749.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607223c0aace5---50945405935.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/7a5ef122e3c86bec8dbe060da6aa28ea/34424409706.pdfIn PDF document text
    • http://atomleasing.ru/media/File/87693825282.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160948f4a00951---35322178474.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f8d906a8f---69629473915.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab83892368---68298377279.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/37889311101.pdfIn PDF document text
    • http://natproperty.com/userfiles/files/jatopegesawosi.pdfIn PDF document text
    • http://geotersrl.it/file/samubonijusadolub.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/07d096afdf90df7f945768817f0a3565/ruvenibizanunodef.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e951ebf40---xosuvepanarabolimiditikoz.pdfIn PDF document text
    • https://bnovum.hu/downloads/91090408370.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/ua8eq7te0emfq38daraqj8dk3e/legodetizopitide.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16092c05a5b606---17628681451.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/672eb92a663e5e57ff9687b619a867c9/35910636382.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/3b7fb8d1a76595d92312026c9d76543d/lofijisomux.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/d5d75df1f245fedf7f3e05c352585d8c/daxodojunemuj.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/sibutigajupewimil.pdfIn PDF document text
    • https://mediacentre.heathrow.com/js/ckfinder/userfiles/files/69647211114.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC44E 17376 bytes
SHA-256: f0d43d1c535d3932e46cb745dcd033225bc1da48999a510538478d8e2b0f4dfd
font_01_sfnt_off0000f200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF200 10964 bytes
SHA-256: 9e86058e006b7d94b8a8477bb3e015c8a7ebb6e348d8d34d3fb88e7f1c3eed0e
font_02_sfnt_off00010b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12370 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516

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