Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d76222681e1288f…

MALICIOUS

PDF

88.6 KB Created: 2021-07-01 10:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c542aaeb520e1627d6781c6a8043ec81 SHA-1: 0e2cc2965131d353b8e0ffae2e29a7a864dd1b60 SHA-256: 2d76222681e1288f47f7f2e282be8aadc47de9f80b3fdc8c9be70f193fe7aef9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites and appear to be part of a link farm. The ML classifier also flagged this PDF as malicious with high confidence. The primary goal seems to be directing users to potentially malicious external sites, possibly for SEO poisoning or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://huntic.ru/uplcv?utm_term=prop+hunt+maps+fortnite+codes+toy+story PDF link annotation
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/88467c30653b27a66d66126074bffdac/4873828798.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/6e00bfb8e9f076ea8915cbb4780fb357/sulekogozu.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b80d872d907---59524712321.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/takikixuxajijatuke.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/e35d6789850bba0fa32f059c54399be2/89683806883.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c8022b0f61495139a48ece9d67e19253/konorewu.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/4f4b92b4d1776bbb7c393a91a8f2b7f4/55844599376.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/jcd2lh6fuu2s2puse0f87vegi6/16434947496.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/95439237643.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/46298998789.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/08c8c99a0db532a93c7c45da85a5dfef/57782865478.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe57976cf8---89113269212.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/86001099064.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/20824852699.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/60e90770d59e5cefd3a35f4929adbac3/nabod.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16072c893c8c70---32346287559.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c25a1f2bce---64592417245.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077ca8562deb---33927158651.pdfIn PDF document text
    • http://escqatar.com/uploads/userfiles/file/file/soviwepunuxiwi.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/foveni.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/45892108920.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906f6800a04---lonijelanij.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/zunowoxulaguxoviwigowu.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/23877673852.pdfIn PDF document text
    • 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_off0000f6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDA 11052 bytes
SHA-256: 2df1f680dc0f1ccd324749afe631ae9614852136a35add0ed12db3dcae9c6650
font_02_sfnt_off0001286b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286B 16496 bytes
SHA-256: c757bef6b7ff9bfb2d78ee835878c38ed832d07cc2d1f46f7d0909d205c39e83

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