Malicious PDF — malware analysis report

Static analysis result for SHA-256 268a1c93c416321d…

MALICIOUS

PDF

80.4 KB Created: 2021-09-17 01:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d0cf1267a4aab02b86d114a042e5a251 SHA-1: 63e3e2d31cf3d2b8c25d04adcfbce501cd2a5fa0 SHA-256: 268a1c93c416321d684cc65fa493a64afa34f0b3678abc4edd05285fc6b3f978
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier strongly indicates maliciousness. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities, contributing to the overall malicious intent of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://shiinamotors.com/js/upload/files/5695169122.pdf In PDF document text
    • http://birkhoffhi.com/userfiles/files/34790348780.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfece84c3d---14584252620.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/botogazomozivomajiliw.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/pepuv.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/98571648214.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/81432838262.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/5mac67pe757v0b8as31d68glc2/mijujexogamiti.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///xadurolapiziju.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/rabaradopu.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109100431348833.pdfIn PDF document text
    • http://mylodge-naoshima.com/11081091094.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/fosumelarinekapunofomob.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613db6c0efd69---24830103005.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/82660679362.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/42201169256.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/72616143580.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/92412410390.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/72168752410.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/likapevigibenopovuxigis.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/21129491826.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a78286a50---lujasagijoga.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/21930349556.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/75528296919.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=real+estate+broker+termination+letterPDF 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_off0000d7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC3 10544 bytes
SHA-256: b33003fc0ed8f29638b2d8e23a1b498ac1fd48a7c99454985d6926a99c59e604
font_02_sfnt_off000107ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CA 16828 bytes
SHA-256: a299d2eca22a4778948e65e8d21771a8af683de3681351f7cf09c50f79c19876