Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f563d5b8e8d9b92…

MALICIOUS

PDF

77.1 KB Created: 2021-09-01 13:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ad2abe5aadb7e2b1dd79134ba4cfb8a7 SHA-1: fa97235c4a7a132a3d3ceb62ff95b63c798efa58 SHA-256: 9f563d5b8e8d9b92ed45235ea302ec6cce4e02070c081463f6398c124b9b7af8
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is used for malicious redirection, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=rules+of+ethics PDF link annotation
    • http://hurtglass.pl/upload/file/wumojesapufeveziwotede.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/zaxawasub.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/19ipa5br08l1vqppame275o5qo/73840667239.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/67433706233.pdfIn PDF document text
    • http://zuche0551.com/upload/file/poniwunixawapumaxujevet.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/depopatotefuzoketunidam.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/seluzul.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f966a4e427---fivudaxopakebifimukezozux.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/60137780464.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57307580985.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/62478639870.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/vepepatig.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/begutovitunibaxadug.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/87242718610.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/xupowujosodegixufizobuvep.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/54779377622.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a8ad7118f---gajamok.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/77f74634e50114c50b6abeb61105eed8/fatijexorizopakosaxofam.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/33529015277.pdfIn PDF document text
    • http://chargers68-50th.com/clients/3/3d/3dd154274af4887fbe356f6dcfc18689/File/88128716232.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/9584f8e6c55cbe20c3c3164c0fd7a22e/zovumatapupeboxikekuragov.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/li4ts2rrute5ooj0g9bfrcm6rb/raresilojide.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/41705760610.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/ce4cda51b9c674c70b4b5a05dd2a4681/zinom.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/6c9767a31bf76d0909e41e19482d6c5a/xirimuvo.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_off0000cac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D5 17900 bytes
SHA-256: b6adc1bc74d7dae491c02593af3716434907110ad64fcdfd0600e0477f3f0270
font_02_sfnt_off00011069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11069 10212 bytes
SHA-256: 1a7cbbf6129d140a29213e47c1249e3947717f425999d8bd136c403106e0ed30

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