Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef9d11bdf941424d…

MALICIOUS

PDF

79.0 KB Created: 2021-07-22 06:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: fa7e1168fc7a7fa0142578756b74cd97 SHA-1: a4c4a67330d55021446420bd0e13ede4b9ba14e1 SHA-256: ef9d11bdf941424dd106a6449d765a6f9861aa5c037d5874c16c78de437906c5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8484

Heuristics 5

  • 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.
  • 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://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/c0204032e05606f248776751225ef8d0/23409216817.pdf In PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0709dc0e65---medipemikegiri.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1ce3bf209---sujazuzikamofetinerazow.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/nafodereluma.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/a4df40199c5a185ea854324eed97aaf6/8398134523.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ab8d71d92---91243708141.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6864c6668d---62250025124.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/54569036908.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16092e46ad7e5f---73827436306.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079b38b19bec---fanukixivusijexo.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b04a88c03ab---rakamokugisedibibiriwigo.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a85b4ece4---xijadituvitip.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/tipetotonajijazij.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/78076102705.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/niboxesa.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e183ac044c7---41457196592.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/sudigakovavalexowebula.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/7c0ec79886a5b4c0a42f7558c8027854/powefokitabikobuxe.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/zikolij.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f85745875ad---16460852747.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/29523164389.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=theories+of+gender+and+development+pdfPDF link annotation
    • 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_off0000f84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84C 16968 bytes
SHA-256: 229bc1bf99302a118716981cda801aab41544b6e7a381144d6c5f151a0b52920
font_01_sfnt_off0001241c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241C 10972 bytes
SHA-256: 344beeded0fc55ccc2bc555f1de02b6ddad8ace0c3720dea6890a4d55ee3d059