Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d4354f93e78a1de…

MALICIOUS

PDF

91.8 KB Created: 2021-08-13 10:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 7d95cd7dabc3ef47bb8c1c021809e20f SHA-1: ffaca4b45b789a603e438a301a5c940c59c3ce88 SHA-256: 2d4354f93e78a1de8528b59598a0ee0b8df0164d6ad525aa25e4f34ef2202245
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous PDF files hosted on compromised WordPress sites, indicating a likely attempt to distribute malicious documents. The ML classifier strongly flagged this PDF as malicious. Although no scripts were explicitly extracted, the structure and URL patterns suggest a phishing or malware distribution campaign, potentially leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df25f6c794---nokagadosuvab.pdf In PDF document text
    • https://menu2uplus.com/images/file/xuwujagalomovuvexa.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/f967c078604cae784a1ccce2d4e15f5f/17877351450.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/uai179ec2s20gkfqd9q4biln4e/liguve.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160984b5d9f25a---zokareb.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/9890467419.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/junesawagutoze.pdfIn PDF document text
    • http://1parareunion-club.com/clients/4/48/482fc251494624b09083a87f212a12d7/File/5263617930.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/savijule.pdfIn PDF document text
    • http://horlickhigh61.com/clients/a/ab/ab3fb267cc30d45b98f460a20cee0b8d/File/pobofudapamo.pdfIn PDF document text
    • http://micruts.org/userfiles/file/sanate.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/penojomaboxa.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/14159808547.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/wevidigofa.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2820703c23---54423695873.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da607b9735---1462098395.pdfIn PDF document text
    • http://nmglyxx.com/userfiles/file/ratukun.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ba991d6dd---75682362350.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/6a5aea0a5f634f16d1ee0b43257c29ee/vanupasuxoritek.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1607693a50eca5---74082324461.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/d8cc4a598d583bb6080e2b5e2be4cd6b/gepimusof.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/xegekozotixiroz.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/85130984122.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/57261127057.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/d8918962a08b92a671b3dc4467806e94/61988902527.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=cover+letter+sample+for+uk+visa+applicationPDF 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_off000104b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B5 10928 bytes
SHA-256: cd71d5e990aba223c8cb91cfbe9cb1dc798c41b10d79f51f39d20d1a957557ca
font_01_sfnt_off00011e1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1C 16708 bytes
SHA-256: 5c97d9ab40d4fce2ef6c6f558f1688d1eeb3d95d9999fce4ef2e0dfd6eb97c78
font_02_sfnt_off0001493c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1493C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1