Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd1a3b542f1b7af8…

MALICIOUS

PDF

81.7 KB Created: 2021-09-02 02:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 21cdad67c165b8e148de7ded89afa0a0 SHA-1: 6a57c9835cb7de345de4801471d410ba594c8bcf SHA-256: bd1a3b542f1b7af89c59fb58054250b92119f12d19ed1c6d96e0402759aafc86
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a significant number of embedded URLs, many of which point to compromised CMS upload directories or appear to be part of a link farm. The ML classifier strongly indicated maliciousness. While no scripts were directly extracted, the structure and URL patterns suggest this document is designed to lure users to external sites, potentially for further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 5

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://s2group.pl/userfiles/file/67357533247.pdf In PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/jerekopukelo.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9025a7527---joludurobozegifevix.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210619105920_d7fk46.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/xasanusubu.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc6ec941f76---29580242393.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/09b8c89feae28783d6d3240e9b646db1/19005601854.pdfIn PDF document text
    • http://odumakus.com/uploads/files/60576027429.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/belerewilemesuxojuge.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/woronozetomedibusibexaw.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfd635c7d1---luvaz.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/ec8b0692d63b7544259e85e9cd345e06/nekokefapakawo.pdfIn PDF document text
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/69399794287.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/18793efba7805d5ceb04f3f57e14db21/72223891254.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/rovilaviluziwoxek.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/cc111dc8ae6d2dd3aed5c017dc9bf65b/suvaliwinotanulakoter.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/nomitivaxitufatotalawomor.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/46252750973.pdfIn PDF document text
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/gakanevumedagofiw.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/6614221848fe8992a7454083b91cd3aa/mebop.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/tadukili.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4e9002178---tawanujagakimufujugoxudaz.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b097baeed---50365195519.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/zubika.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=those+meaning+in+malayalamPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD421 20136 bytes
SHA-256: 1e48c201fb5de14b72c2cfbab70090286280b047c882d7e318cdc21dc3f50543
font_01_sfnt_off000108b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B3 10436 bytes
SHA-256: e0c75ff286e4469cde9bb757735a31d7c2bac505670775554b1053b08c05c55a
font_02_sfnt_off0001202c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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