Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e786fff89fbc73d…

MALICIOUS

PDF

77.8 KB Created: 2021-08-29 02:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e7f5507a3805921d0fa31f3554a635e4 SHA-1: f9835d6451849630331d37adb481e0533c808176 SHA-256: 3e786fff89fbc73d75850c7f91b7890bf5bb82b65ece88b56bd2cf601ae55393
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous distinct hosts, many of which are compromised WordPress sites or disposable hosting. The embedded URLs suggest a lure related to document conversion, likely to trick users into downloading further malicious content or visiting phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb6a81e600---71731116110.pdf In PDF document text
    • http://gamebonda.com/ckupload/files/buwovijedinokemosikal.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075a4aedac6c---80893203099.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/12944317619.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/87153803741.pdfIn PDF document text
    • https://a5productions.com/home/a5pro/public_html/ckfinder/userfiles/files/16717911003.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/34f07989a0fa3461829ce7783d21ca45/54965908237.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/57674809899.pdfIn PDF document text
    • http://jhferry.com/data/fckeditor/file///natararorilas.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/03e8ec06eabd01fd232231be42388bc1/xorebejatekexokal.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ee2c298ed6c---75030014884.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/2c1d89733c8d84cf57c064e6f291bd95/nuzobuvarevezamovevote.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c10c45244---45287546815.pdfIn PDF document text
    • http://blissworldbeauty.com/newerac2c/userfiles/file/wurapowuruturimelupimoja.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/wetivigasidafemekameg.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/69029444627.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc386cdb19---bupajowufajape.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/8250863027.pdfIn PDF document text
    • https://saam.vn/images/content/file/61549346322.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/fdma0bv9m83rdi9oggon4qka64/90476954291.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/08ad3f90b6475f9cc0eeeceb099e404d/57235248983.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/89848551552.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/fuminomez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=best+way+to+convert+word+to+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_off0000cb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE368 10792 bytes
SHA-256: 064fc9517fcbe69bbdf1efb525a908fb27667819d6f838be3679c2c78a63acc9
font_02_sfnt_off0000fc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8B 17276 bytes
SHA-256: 71b98aecb4826eeabf3c782fdee103a4115ef76317caea976f740888ad9267b3

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