Malicious PDF — malware analysis report

Static analysis result for SHA-256 864b814d43fdfde1…

MALICIOUS

PDF

108.9 KB Created: 2021-09-03 07:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: def62405b7d55c333d134b5b013e2d01 SHA-1: b5ae54d7b5abe3a2f6cda9d7a1f89eb715617c76 SHA-256: 864b814d43fdfde163c05b8049ce3480a2f39d3b44f529cef56cc1be8667ef7b
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites. This suggests the document is designed to redirect users to malicious or SEO-poisoned content. The ML classifier strongly indicated maliciousness, and the presence of embedded JavaScript supports the T1059.007 technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://goref.ru/files/file/nuzelixemilunosegixumafu.pdf In PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/a4897fe1a5d5a22c26ec6af19ecdb67e/15470042163.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/cnfiselma3rrdgppt2tv5f0aak/43487875284.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/duvozorixawusuraroduzagev.pdfIn PDF document text
    • https://digireg.se/upload/notapekori.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/1f8b6a53ef21ea39dc6c2b2ec3f94a25/sibilukerejova.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9960fc65edabbd5a120d64ae5921adee/55767622387.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/nuliguwu.pdfIn PDF document text
    • http://ruresept.ru/files/file/8371553969.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/1hrehs9nn8dckarvhr3a6nfjgt/xexolarizolu.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/ruzokup.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/3258aadfa6d941784e4e731819c90ced/botawunebaneninimu.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df8a6afe34---95630115869.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/34403511247.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/17991273973.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/9ccb01f3cdde6818f5bab613a7414daa/nofazejavuwasexer.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16078bbaf4ca16---16282867803.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/kovogis.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/wisemorawi.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/fef27906f3f2d7f37ec304be95fbf7b8/lilunifunadagadesajawub.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/mepemapatixe.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/suladikibefot.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f6fa9bd62---57526248204.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/ce7f1f57c64c887dc9883ee7248af857/vewunojoduro.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161262645abbf8---gokovop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=basal+ganglia+adalah+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://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_off00014621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14621 18640 bytes
SHA-256: 0e7b4afa4b4a686dd1aa86b65ee5b3bf629ae9f5f30f08ad0bbdbacad044d6a9
font_01_sfnt_off000176e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018f00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F00 10380 bytes
SHA-256: d7e803efdff9a9c5ed1ec7b8bd7227e6c728725928225123b236fdaa0e349477

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