Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3266cddb9f05dfd…

MALICIOUS

PDF

122.9 KB Created: 2021-09-12 20:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 16e0576269635155f29c7f29510c53ab SHA-1: 89ce84e6a9d6d4c775b2d43b2fc462576e04e623 SHA-256: b3266cddb9f05dfd001374f9398effbaeee0777affa8278472cc108dd97574c5
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The heuristics indicate it impersonates a cloud document lure and presents a download button, aiming to trick users into downloading a secondary payload. The presence of multiple links to potentially compromised WordPress sites and disposable hosting further supports a malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9884

Heuristics 9

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://zhhyhb.com/uploadfiles/files/72006136708.pdf In PDF document text
    • http://tomaszskiba.com/userfiles/file/37679100693.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/97471170628.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613080e743f62---sotitofekefuratabowiki.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/73072901678.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/jilebum.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/12632624123.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613427012bda5---1601796908.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/19975153974.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16131d2a20b6f1---nitinapapagolajawi.pdfIn PDF document text
    • https://nsaimmigration.com/userfiles/file/vafiw.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/52128998522.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/2cba1e3969bfae0d270ef72f71f79d62/8927179281.pdfIn PDF document text
    • http://generoussecurity.com/uploads/33318113239.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/futamesuvenabujoxedulagek.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/xuxuwunaw.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/4775339491.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210912_9CB4C803099EBBEC.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/gugewonuwa.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/rurox.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/katufeguj.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/70650621798.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/25519845462.pdfIn PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/83250312173.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a40a1212b9---55203229628.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/rafebogevorodufumakawaba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=o365+sign+onPDF 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_off00017f60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00019772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19772 18088 bytes
SHA-256: 5147b694136631f7e145b5b5359d8919ff2098ffd3c9ad136f5efed4acb77099
font_02_sfnt_off0001c6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C6E4 10244 bytes
SHA-256: 4a408a2c65871c0825191819eb5982a3158e1949750a299946170b1ce1a81391

Open this report in the interactive analyzer, or submit your own file for analysis.