Malicious PDF — malware analysis report

Static analysis result for SHA-256 37fb853d538bee55…

MALICIOUS

PDF

90.3 KB Created: 2021-08-21 18:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4ce245b2bb411c663e45a536252c163b SHA-1: d9f9d96aecb447a761d1513c7c65372730c643be SHA-256: 37fb853d538bee55e1bc3007211ed6c8684f8d870b354072e2704de7d40836aa
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of external links, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier strongly indicates maliciousness. The primary attack pattern observed is the creation of a link farm, likely to manipulate search engine results or to serve as a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://chcial.ru/uplcv?utm_term=how+much+do+nashville+songwriters+make PDF link annotation
    • http://tradeweb.es/userfiles/file/pikinukavo.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dbafd573e20---ditoxatewit.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/70826384507.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/49352442339.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f75e8f3d4---63574401752.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/22336222033.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d97d479fe57---21624559408.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e766069f2c---kozivaditizoximomupapubor.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/98138592648.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/tsldi1ngqocrc6qs5rm4e765c0/8158763775.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160993c363e3ce---50036298914.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f79741a74f---xokalefodelumowuxar.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e15aea411e8---zotikobopibobob.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/18861707334.pdfIn PDF document text
    • https://avenue102.com/uploads/file/87048710876.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/34301636468.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097a1d1b9f5f---83036361542.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/91202897553.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/fivajezitazi.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d00d074db67---40436499587.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/susixuwaz.pdfIn PDF document text
    • http://www.conectadoscomdeus.tv/arquivos/file/jajenawabolisiwawojaroriz.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/6682844696.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/gilutorikawizexevivevuvu.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/gifilikefixapeni.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/338706091.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f53c238d8d9---nixewujefalik.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_off0000fb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3C 11152 bytes
SHA-256: 2ee9b793039f1c8134855f45e888d11f5bd2c66cd89aae65997c557e81d6761a
font_01_sfnt_off000114f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D04 17604 bytes
SHA-256: b6849a50ac2124fc7c4ab0fb9cf4c8719f98075488fe7d3791186014a6477266

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