Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c4e08853dffe3f0…

MALICIOUS

PDF

62.3 KB Created: 2021-09-07 20:14:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4cc30b53a5f744fc123ce96b2ecede30 SHA-1: 89bf4365100c7b9c10d375f35136b88e6a565ff7 SHA-256: 4c4e08853dffe3f06b5a57c83961da4c0fdfa7abc27ba46a1346b4414a4cae77
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The heuristic firings indicate that the PDF acts as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature, likely aiming to phish credentials or deliver further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8760

Heuristics 6

  • 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
  • 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://banghaija.com/userfiles/file/boduvaroludo.pdf In PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091cbfb4dddb---bodegosige.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/75580169424.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/gojakaveworejiwiwojipizas.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/04cf712f12b74467a11783c8a1257e1e/25457347871.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9d68a9543---21023861895.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/74572193780.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/dea964d090a5adb7329f18dc2a7d1c98/pipozefozodedadadewo.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/d1e96a5857ecc4a3113bb4a263c443d7/zizisafotuzetodazum.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/rizajutejorazuno.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606edb83c41db---52699140997.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/720989fec5b48bb5e03c917a32effb64/fibutunamabukusomidixo.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/jexilodezufodeb.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/mivasujodud.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/t9n136f95ekum0vqrtlsh4dvf2/karowipulowige.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3525c10386---49328049407.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c080af653cc---34662528906.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/nevadejek.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/parotuvotetotiwukobir.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160e040df3e0ff---luzerejuxatemebawebugejed.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/rijemisufasosak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=digital+photography+book+pdf+free+downloadPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dde33d5cd26---39500325538.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB938 16124 bytes
SHA-256: bf51a14b8702de6cbae8cc24e4f86641e36e21b4bf6f08ffd85033961e9eee08
font_01_sfnt_off0000e225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE225 11044 bytes
SHA-256: b2dfd46090a244f47b6ec16b14b1b9cbb2c7ef63adeceaab7f348b942c3a24dd