Malicious PDF — malware analysis report

Static analysis result for SHA-256 372684b3be53d1b5…

MALICIOUS

PDF

82.6 KB Created: 2021-09-08 04:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 78595d2b1d958900cbee3c8cd6fd4b1b SHA-1: e3309eb2a68b87de85984aa12f46228fa27461d7 SHA-256: 372684b3be53d1b55a015e061d40c1c8c16b60f0183e1096c7ab4e1f8f57203e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features numerous links pointing to compromised WordPress sites and other potentially disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/ed750b76b4fc786bd04559dbf4d7db5d/kadewekazonimakotibuwoti.pdf In PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/vejajuzodezagegu.pdfIn PDF document text
    • http://portalkucharski.pl/app/webroot/media/files/14018279653.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8414287175---4994763548.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/a354207e8ea36532a1745b9a6f868136/86454228417.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cfacd885b45---55524254313.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/lajevafesawarifozubagu.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/07/files/210716103012.pdfIn PDF document text
    • http://theettiaresottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/gofigifo.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/86779464548.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/bajugojuxilunaf.pdfIn PDF document text
    • http://muslimofwestbengal.com/mwb/editor_upload/files/95086504547.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd2aab50bd8---8680197713.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/85524012717.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/39369040931.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021082018504641.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608c01eaa00a0---88536512782.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/41353133005.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/vetepa.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/sanugasej.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d202017db50---pabedeganifam.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/23568815263.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4c0915d2e---delozuwurifivolixobopunid.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ecabb97de09---45407257889.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/veredod.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/lelawenifasedodu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=lattimore+the+iliad+pdfPDF 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_off0000df01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF01 10448 bytes
SHA-256: 51fedf905db6dd68301af39edd4625a32e990397c17882cbb28ba58d84ed946b
font_01_sfnt_off0000f6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010eb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB6 17808 bytes
SHA-256: f0618afbf1d312e7919b67ba8744ca88ae9c327e1f09414f41892b750d7787d0