Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a894e8fd713d68…

MALICIOUS

PDF

85.9 KB Created: 2021-08-11 09:41:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 9d4f18486754b67c702639516d33c9e2 SHA-1: 0fa4bc65043eabf52dbe91390df4e2ee69278df4 SHA-256: c8a894e8fd713d68f96cbedda435ae869064f87e40a4922a9a46f5979aba64b4
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 0.8879

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 http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe60d6d465---39152015573.pdf In PDF document text
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/xewaziwelakirirozowubeko.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/xirena.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeecd6c187a---80258147708.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/759bc26de657adc8af99a87838dd176e/sexugipalidenujakevufami.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a51a0e1526d---60939502965.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/93362180782.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/limemo.pdfIn PDF document text
    • http://hamandeggsclub.com/clients/e/ee/ee862789ee8b59d3f3d22261ccc35c80/File/wusomegupotagalixoviwur.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/96307327902.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/gujekojipetotezojufetazid.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/6290094295.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/40487092482.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7df581a76---25262194605.pdfIn PDF document text
    • https://troypin.com/calisma2/files/uploads/jadososakemufijokonap.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/p0ad6gqhu378u4g1q3k5mlafph/95365709030.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/7f62c6500833484fb8a32733208d8fed/tewofuko.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/suxigutawimolesizawejerub.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a7a0356b1---78188522002.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609feae065776---6214707387.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/38295207207.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdce87b85f---karakumolizepujegobowos.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/ece675d5fedf2659883cb3fd4e7c7323/suponotosedibivan.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/f759dbf6366e4711861623dde00aa6be/wimawizagesugazisuxira.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=us+certificate+of+origin+pdf+formatPDF 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_off000114fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FB 16588 bytes
SHA-256: 05de7802fe921834de306b3373dd7b9f91c3e935ff86b371af26d0f9435a8c95
font_01_sfnt_off00014013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14013 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1