Malicious PDF — malware analysis report

Static analysis result for SHA-256 11c3edd49408b496…

MALICIOUS

PDF

76.3 KB Created: 2021-08-26 22:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e3e1d28cc0ae7afee664aec4e5a08443 SHA-1: c460a45a4917ce2c0f85ecce256d1979513ca0ef SHA-256: 11c3edd49408b4965d53ea304f37d2b0b1bc83e7dfbde7e5a17140a41e43a772
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are structured as link farms on disposable hosting. ClamAV detection and ML classification confirm its malicious nature, strongly suggesting it's used for phishing or distributing further malware. The presence of multiple external links indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5355

Heuristics 5

  • 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
  • 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://medvor.ru/uplcv?utm_term=non+assurance+services+examples PDF link annotation
    • https://pet-fashion.ro/mm/file/6439796943.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/91374049472.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/13148465044.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/29950052697.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/31927821403.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a49d56b205---jejavonow.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/83511197892.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609cba8b08776---21476356208.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/39780251609.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/83837e443b1fe58b10750cb2e0987b83/runafagoforosujogamur.pdfIn PDF document text
    • http://bulmarconsult.com/files/74169672478.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/7683449037.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/dufavoripuwiresesakake.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/91125153940.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/42ae990c32371d995fd91d1fb6378891/82720606783.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16125539a0d4fc---wudafazevufumarolitodoj.pdfIn PDF document text
    • https://a5productions.com/home/a5pro/public_html/ckfinder/userfiles/files/jepozipekom.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/cd1c6597811ce7e6b4a2f3b6c68d3506/45455584169.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/xeturuvukuge.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/gepefimereniju.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/jidova.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16091e8a1c54f9---74921945449.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076fdcb5d6b3---85874831805.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73C 16988 bytes
SHA-256: 6d3c8fa32f9ead4d4e31d84d5e381a4996dbc0c353dcd8c166e16fef2a493159