Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2428d50c6ba8afc…

MALICIOUS

PDF

72.3 KB Created: 2021-09-01 03:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 92ff3a24f88a17004db732b023e53072 SHA-1: 2483a45bb071532449a177c5cbe91ff3cfb2f75d SHA-256: d2428d50c6ba8afc95f7ae8a3222ab1496b04376c79d8ff8224e4e69e9eff4f5
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to various PDF files hosted on potentially compromised websites, suggesting an attempt to distribute further payloads or conduct phishing. The ML classifier strongly indicated maliciousness, supporting these findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://wtmasonry.com/ckfinder/userfiles/files/kebabiripelepiko.pdf In PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210706030640.pdfIn PDF document text
    • https://cpc-serbia.org/js//files/5863600740.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/53406876998.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/zinatuxajigubaso.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/ce74dddfecce46dbb2053cfe2ff0676e/buririfobaforojutexa.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/zijosaximimokopixawevova.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/bugofamevetulu.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/bfb8f2e3b42b05163dabc2fa6658af00/33520371372.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/nujirijomifumebelab.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/zikenok.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/12299870361.pdfIn PDF document text
    • http://ausafe.net/images/art/files/minelifetoveripedoxobipil.pdfIn PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/7d0e53fed4e40ba3b64a40c539b6edc2/94369683954.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/14554026737.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/42016005249.pdfIn PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/960ff75ce3d76869d3788e2264859239/sotujibakirabunalov.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/ff8b24473fc24a9eed359d3acfa9f3f4/74809122019.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160975239665bb---xazivobudiferisesa.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/xogug.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/cca1b4b5b884d5c71b9603a73016c73d/dowomibixakod.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/00e441065e2b09e82de1caadc4ad7a78/kerozigimefepopipeve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=principal+of+business+management+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_off0000bb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B0 15128 bytes
SHA-256: f494991f9f00f904a1157a842afd34f548b22e6db2c1126fb99d48db72b00d0e
font_02_sfnt_off0000f99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99A 11204 bytes
SHA-256: 6a8831f4a06daeebbd86f6e7d4b455fec90f049c3b856497a2d78cf7eb867563

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