Malicious PDF — malware analysis report

Static analysis result for SHA-256 6584b37bba2f7d52…

MALICIOUS

PDF

70.6 KB Created: 2021-07-06 02:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 4ff202def0c2d067b8155b9d9c56668e SHA-1: a500be1e9bef124b09915afa4d87a5f1c5a8a789 SHA-256: 6584b37bba2f7d5225fd2a8547c9790a83257042c078671c69922f9ada7300d8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple heuristics indicating it is a link farm, with several URLs pointing to compromised CMS upload storage. The ClamAV detection and ML classifier also flag this PDF as malicious, likely due to its structure and embedded links designed to lure users to external sites. The primary attack pattern involves directing users to potentially compromised or malicious domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7429

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b488d8cacac---53169280589.pdf In PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/95464414628.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/romamaforu.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/pejanugajen.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/be6d3089db23d0b3ca995453db1949a7/45580761131.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/75877845654.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/53700d532b78ce56dcd375d2acac1790/65232687091.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/4286c20d850135239ad9f9d105f5fee1/61600094903.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/megunu.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a4eed974c---15882945042.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a161f0c12fc---63547100032.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160ce2a9e491c7---ribujedewavus.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/3139649718d411d5e3166e05be74783b/86521565584.pdfIn PDF document text
    • http://lyonsmcafeereunion.com/clients/a/ab/ab8eb7fa8d7cf94b91f67e7e346c80ed/File/fimuxasovojob.pdfIn PDF document text
    • http://lblussana.it/images/file/14260969644.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ec68d7e63---50351264934.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/4045f61c55cc91a3ccaa67bef4d41e68/xonitewalanubifuribesew.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/c2jpkj5bjsak8vjg35qf785n07/senilifi.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/xaweliba.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/wigubofinusotetuwusefuxoj.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/cef71a5f076f7248b0b5d2fa5ac49682/xulelilidopemilizodumil.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860632a72c6---nowirunafesomovipijiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=recently+sold+homes+sunland+springs+villagePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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