Malicious PDF — malware analysis report

Static analysis result for SHA-256 98a568d3858afb6b…

MALICIOUS

PDF

64.0 KB Created: 2021-05-21 14:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce03913cf5426a38e9a7d011cf816021 SHA-1: 0abc6e0d0b13b86ae73ad9bd109e0b3316bf62e2 SHA-256: 98a568d3858afb6b5b7c7535e49938c467068ac66aca03a645b7297fdab91dee
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms, indicating a link farm designed to distribute malicious content. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the structure and numerous external links suggest an attempt to redirect the user to a malicious site, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8701

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://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/5167d87709d6f15bac8ab50e6df27677/jedugapopo.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16093047d9b51c---vamazelakenuxanivas.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/l28g002sf0iu8c88caecp9ube6/72473557257.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869b88b89f8---10082334009.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/35d4d77bd997d10a3d8730c951d974bf/rojudebogufedizidafobin.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608b55ad0d67d---buviridirinaporat.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/72209fe31dc020f3fd3e123d5919ff71/74539072687.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160872b6acd37f---96719986054.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608752bb4560e---zamapakozolodosepe.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/8a7bc69569eb6b719d9446fe793218be/lumozikotama.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/55666d730ac21cb446a0923469a7950d/satulunubov.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d094f88d54---leguvikiwurobari.pdf
    • http://botosani.ro/img/uploads/file/denikasagajusetodix.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/1f7a48a4ogth53h8j75a22ss4t/4876010325.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/8570e2ed813fc364615cba10589ba5f3/18764802550.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609262b8ed4ed---sikivarero.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d587b4c62a---83930480008.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=free+reading+passage+with+comprehension+questions
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d824.bin
a4b0f2c45b869a57cd2d8417c4cfd93aefeec402ef01ba961c2851cc8235485c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD824 5628 bytes

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