Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6f7dcff9fb962b9…

MALICIOUS

PDF

73.4 KB Created: 2021-09-02 23:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1926bc7c52b4f5d491059ee157ed2d8b SHA-1: 41350dfb7b11a375698e90ab3f25ee4090ddabf1 SHA-256: f6f7dcff9fb962b9759edea6b094e94cbaf6ce8fb72912b3326ae317ad1679e1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a malicious PDF used for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c241f93e4ae---texumowe.pdf In PDF document text
    • http://avvocato-callegaro.it/public/file/22689331015.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe8ffdf5f4---movokadowutaxeriluru.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/af0b1fb7e68137fd5e8c408b32592e85/dikesiko.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/5lgb5e4lju14a0a91667h4d585/41147606799.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/jaxizigob.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/tavepenowedigomufuxik.pdfIn PDF document text
    • http://fitviewer.de/files/file/10637739130.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16108fbe4a2381---50058360190.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/lt8ndfg5ev1rmhn47h5bfbn7d3/befutowuwojizozavepiguru.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/71859998097.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/34860552969.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/28180903242.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210702103047_jm2gni.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/f68f094792ccf7b1f498cb032adc1b2c/91343668344.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3067bb74b---firovidukena.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/509601692.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc5639a2b6d---79247694418.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8541bf0049---29489269579.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/tavilewiduridope.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/lilavepipasuwavavesileku.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d6d15501f88---89606532181.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160732e3caaa4f---povosuxunubuvixi.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083089c6620f---70737245328.pdfIn PDF document text
    • http://bosch-service-center.ru/uploads/files/90971290462.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=precision+machining+technology+2nd+edition+free+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_off0000bc2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43F 15816 bytes
SHA-256: db18cdfe7e096412126b8c9aaeff24ae377220c14a0387cdef7c56fd4322d7bb
font_02_sfnt_off0000fd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0C 11300 bytes
SHA-256: 6fb16e7c326b5c548479c5fdd8b240c49e4e5b205e0792a9658d237a4a32a322