Malicious PDF — malware analysis report

Static analysis result for SHA-256 8252d1456df4e216…

MALICIOUS

PDF

80.9 KB Created: 2021-09-09 00:35:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c562b690d7beef86cd2e521cdea388cb SHA-1: 0df6599d2a395be1a076cbb862e1315061deb32a SHA-256: 8252d1456df4e216f55f68478c3c8807a0d7973d13504604ff998e4f66e44298
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded JavaScript likely facilitates the redirection or further payload delivery, while the link farm structure aims to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364b756b174---popepomikinanu.pdf In PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/96003026567.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/tuwap.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/bojijuguko.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5a985b61d---tevuvutixakevaselete.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/967bc68cda4c688a4851d451c932665b/69456044563.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/76392735407.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/fazakapevuxeworeva.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/firexisifidavi.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/bebopojededa.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16133ede28ad2f---wekizakonetegutupotik.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613009ca90571---dukamajaniteruzixixi.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136326ac25a6---nuzetamev.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/vulug.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/jafilegax.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/takevowalogoporaxudor.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/dojaxaposojovikuxolimo.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161346b312ca56---gorugajikovorobotuliwib.pdfIn PDF document text
    • http://vodnik48.ru/content/file/8967154206.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/27734296028.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/dewazobevufajenobumo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=redmi+6+android+10+updatePDF 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_off0000d781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD781 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF98 10824 bytes
SHA-256: b6b0b108d2037c132896c79a46a4f84476086a3a989088275f502e373db6d71b
font_02_sfnt_off00010884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10884 17760 bytes
SHA-256: 0c8ef7a9405927e5d756a8d1756283ea60897b70768ab4c6ecf40bee448fc553

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