Malicious PDF — malware analysis report

Static analysis result for SHA-256 28eb40cee8efa99f…

MALICIOUS

PDF

69.7 KB Created: 2021-10-01 14:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 01bb71bf9d0c4a6cbe7b464db14ba2da SHA-1: 1e7cbe6bdc128de4cb2e3b79f1eaacf154346b7c SHA-256: 28eb40cee8efa99f63e9866762f8292201e3e51d65453060a39b71e9e86412ee
104 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 https://krisoc.ru/uplcv?utm_term=noclip+para+geometry+dash PDF link annotation
    • http://mlead.net/images/e/file/wilofazekax.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1613baf7916a33---23521448911.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/wudabejulariwoxegefon.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/41587218061.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/90977009457.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/miresamadufamijob.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/39952634878.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b9e42aedc---15175840586.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/55443869382.pdfIn PDF document text
    • https://mashura.co/userfiles/files/karer.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/40653144844.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/49865056703.pdfIn PDF document text
    • http://xn--z92bzy85x.com/userData/board/file/gesolupesubokisijonibejug.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/73847941481.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/jubojikopasotugekasuwod.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/88156171740.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161340a941b73b---wujevakometivomi.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/kusoguguruvarogi.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161367d9459be4---88584642127.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/18587534454.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/66023030342.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eae534af24---58518345600.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16142ea0991777---dejifidubof.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/fifef.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/29654381267.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/219906c21cd81c5cbe090c30f4d75cb8/74654138343.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_off0000b288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB288 14924 bytes
SHA-256: 0b969a8c0f511a6653acc0d007be2b6dc8a89b704ee16c32f149e24add9ee6ed
font_01_sfnt_off0000d812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD812 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF029 10948 bytes
SHA-256: 24323426a95dd5c5d5455bf4c90c66c1bb7de8c640098439a6f024fa5a4c40bb

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