Malicious PDF — malware analysis report

Static analysis result for SHA-256 b631ec1a9b4c1082…

MALICIOUS

PDF

61.5 KB Created: 2021-07-31 08:15:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 685bac8822f8d840d09fcae8b9f94a8f SHA-1: 8d5a6ad244dc4c86c1057e9363bbd0e3b1983805 SHA-256: b631ec1a9b4c1082ffb7321189bca096ec8e79e00a0126dccfcdaa1b166a97a5
94 Risk Score

Malware Insights

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

The sample is a PDF that functions as a link farm, containing numerous external URLs pointing to other PDF files. Several of these URLs are hosted on compromised CMS upload directories, suggesting an attempt to leverage these sites for distributing content or for SEO manipulation. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6040

Heuristics 4

  • 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://tezerwatch.com/file/upload/files/06-18-00-18-16-34.pdf In PDF document text
    • http://rocb-ap.org/file_media/file_image/file/jojimubodijetolelunetib.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a50585d5882e8674861a544cb8dbe8ce/jaxitutudiwipin.pdfIn PDF document text
    • http://trevorhannant.com/mijomiwat.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/62a192b2f80212b4b4031e89e2078681/susabomaliwexanudakawib.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/sogemefukoxexa.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/33230706102.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/werobe.pdfIn PDF document text
    • http://instandee.com/Images_upload/files/44410064465.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/69236943613.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/vgh5s30f714kq256p4b0sm2mh7/jilun.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/53378856473.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/neguboteligiroxefexo.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16092d5438bc46---92485467470.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/xotota.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160733bd646538---boxon.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d4c6d317ce8---xojonoburotuxuku.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/mowexagavebobir.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c88451e504c---43198167242.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/37229225698.pdfIn PDF document text
    • http://thelewisfamilyreunion.com/clients/c/ce/ce72a6ed4f7059d305e3bbfb121cee90/File/xesed.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/57662540956.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/b0dfe0658e3dffcf2855423e330023d6/67719206165.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/a7fc4349aacbe736c795ff9d87409372/91795904988.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=what+do+blue+dragonflies+mean+spirituallyPDF link annotation

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