Malicious PDF — malware analysis report

Static analysis result for SHA-256 76ce3a69597611f4…

MALICIOUS

PDF

72.4 KB Created: 2021-06-29 05:34:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 65b781784550b5dc352c5512159bddea SHA-1: ef56d7bf7563f88cb0a497950149bb57b7073919 SHA-256: 76ce3a69597611f4dda780b85e625b8c1a3e9bc5602afd7f10d02785639050b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to distribute further malware. The presence of embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=css+tricky+interview+questions
    • http://matsusushionline.com/uploads/files/37342714658.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/eg3evacvcvvsvshqqej7gq7c12/47489716502.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/744046b3c90ffb5f636392b54d164a32/gawutupulexupekaze.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c03dbc467eb---50461434553.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989dec50f43---90429185266.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730c22c1ff5---90857900051.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/9f36f83da63e2430310689768db9ee5a/xuxulemup.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/67018476badbe33468ed20367baa82aa/9330025089.pdf
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/8559e1560371b9892f42b944b12646d9/48569951192.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d9bf4dd7151---25913380562.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bccabf2d33b---jobusakotu.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b739ff5acbd---38642731913.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac855b23e94---78340616554.pdf
    • https://alexandrapanayotou.com/web/images/static/file/57810928864.pdf
    • http://natproperty.com/userfiles/files/gipuripalik.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609449ec33709---sesit.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c65713e3c1---pawinuke.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7657568f2b---rudob.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/de8j5ujdh5cthk1jllf5e9ppe1/wawaba.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c942df90cf8---dowep.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/bc2ee0b8d81e411cb70a3972382189f2/46225936501.pdf
    • https://hasekei.jp/userfiles/file/savutotoj.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bace.bin
d0cbe6370f646651c08eb3da4204209ef858c48c90c8575636b34a5fae7976a7
pdf-font-stream PDF embedded font (sfnt) at offset 0xBACE 15916 bytes
font_01_sfnt_off0000e397.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE397 16792 bytes
font_02_sfnt_off0000fbae.bin
7b9388d5429bd92b183486ea7073b280957c2c98613685c015028f73cc230f2e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAE 10648 bytes