Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb8688d5fcda1a88…

MALICIOUS

PDF

76.6 KB Created: 2021-08-22 06:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0e4599c8eb6390dd9838ff991f701d8a SHA-1: 40d512a527a4eac32d49569bc9b398b98bbf2ae8 SHA-256: eb8688d5fcda1a8893796bdab6eebca0033f2ec018bbac1b6c0be75efee6b268
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to distribute further malicious content. The ML classifier strongly indicates malicious intent. While no scripts were extracted, the structure and heuristics point towards a downloader or redirector pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c658c983015---bifunavixixadeti.pdf In PDF document text
    • https://luyenthitoeic.info/userfiles/file/vozaladajuditiga.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/161010b106bf85---munisuvolovasizodepowodos.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/26344440300.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/33431426924.pdfIn PDF document text
    • http://gpp300.fr/userfiles/file/bawenagemikoxajag.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d31c035c4---nobovimuvodinebogagivag.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/dogaloridevotirinozifira.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf2a4f35f7---38406097356.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/mhj94hfhfbb3t58jac5045jnc2/lezoxezamewimu.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/vogasovajud.pdfIn PDF document text
    • http://suachuamaydemtien.biz/userfiles/file/47961845825.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/1569732182.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/fididoj.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/vulidakakiwexanuwevur.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/runezaliwikile.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b763d592805---rezajoseditumawuvew.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a75972509---nikiwakogozunegojixuwalox.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a39ec0d2f---vimenorebub.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d4347aca8---xusegebafizu.pdfIn PDF document text
    • http://aven.su/userfiles/file/bofitofilebuxulep.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/pebawesoka.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/b00a31883a6ab66bf939ad18e4bd44b8/11693541504.pdfIn PDF document text
    • http://kaies.cn/upfiles/210531014634178158rdh9go.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=motu+patlu+cartoon+video+song+gaanaPDF 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_off0000c7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AE 16668 bytes
SHA-256: 15c59e97bb8da5eecce66c6a81dad572532e75829a73d1e8fdc751d4257cfc73
font_01_sfnt_off0000f2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010adb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADB 10848 bytes
SHA-256: d8fb5cba92df39b2ebed6548da84f8bcb348ab3e52ef8f77387eb4410c17c4dc

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