Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa59f5d2f3bc6cea…

MALICIOUS

PDF

86.6 KB Created: 2021-09-20 10:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c17560fc70429a84bda067c2566d0c00 SHA-1: 4d0017b01f1869817f618b2f21f19f44b14281d4 SHA-256: fa59f5d2f3bc6cea7f46a794862350b67e90fb92cadc085d5a53104e575f9ed9
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 compromised WordPress sites and other disposable hosting, suggesting an attempt to obscure the final destination and evade detection. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161439c0192875---lugekewofivob.pdf In PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161447b91dffbe---petigi.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/xajojitiredajomalol.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109190635385105.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/76060159842.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/zujekejipo.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/fojikamudu.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/6497611965.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/74543975862.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/49897885646.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614486c135294---mamipi.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/ripagoma.pdfIn PDF document text
    • http://domplus.su/userfiles/files/kafomofuxujurelulifap.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/58306105443.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/jawenisoginida.pdfIn PDF document text
    • http://imaginove.eu/data/Files/24685422399.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/mogakemup.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/e31ae30389f8cb054280c068641b2d24/98164623273.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/59703922614.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/kka4mdtc68c9dp3h583uvdp4k1/zakimejimegonalixu.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/b2c2d6964a5a45a77e54df66da3736ed/97183456944.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/5444077780.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/xokubumoxabi.pdfIn PDF document text
    • http://wixoon.hu/upload/file/rakomesatitowuvilavasuwe.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/64424392656.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=manga+pdf+free+download+englishPDF 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_off0000ee3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3D 17704 bytes
SHA-256: 2454a972ed1352e50dd43e8b625eabe491caedfa20c312cbb69f3f539a00da10
font_01_sfnt_off00011be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13400 10756 bytes
SHA-256: 7e07cb3f618bb6d343c9fae78f157cbe930c4ad9fbbe2e2edb61b61cfa8031ae

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