Malicious PDF — malware analysis report

Static analysis result for SHA-256 30ac94ba74afb61a…

MALICIOUS

PDF

230.9 KB Created: 2021-06-24 07:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: a54b9a9613a5d688a2af8abb7f9ffafd SHA-1: 413d20841305d0335dfb2e170c39307f54bd3c97 SHA-256: 30ac94ba74afb61aa4193e820b0d540703668672c1cdde9c2fb4038bd9b414e7
66 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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.
  • 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://emmaushuis.org/pages/51791840585.pdf In PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/p7uf2at3a52iqbb693sf1cjnq1/79225013856.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/a6161facd7879f1bf76d376792d8b310/kagojaw.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/xupamane.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c5ce0cec3---nadokogosifanubituretemu.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d77bcf3412---89421197299.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/0c841efdf40ddec82eeebb2e63b0fa57/niliduruxesuwejozo.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/2752182999d2866f21ec78c9b1e8a3a6/sepovomasisi.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210510055905.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a09355a7da1---39767101363.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/05/24/file/20210524_220238_113.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/ir801gs4ian9iqog7ccffdafkb/pirukax.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/bfd40a10dc8dc08e3a8df66bf15ef49e/zeleradimib.pdfIn PDF document text
    • https://123natura.com/stockages/files/lulanamuteru.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/55725406029.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/vutisebivi.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/d067a86ab49d1d5ddd77fbe7fe514ae7/30367619430.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/96745795568.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=network+design+proposal+for+bank+pdfPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000340b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x340B6 5472 bytes
SHA-256: d1de37a3a1164ba897413dd3f52f415a86f700322dbdd93f2e4a339685051ac5
font_01_sfnt_off0003537c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3537C 20696 bytes
SHA-256: e0e44056d2257bc543399fe54dad2a33a23eab302d24905f2a4922858847432a

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