Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea4161b866796621…

MALICIOUS

PDF

85.8 KB Created: 2021-08-04 04:20:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f2bd348adcf4109c447d13bcc09eddd9 SHA-1: 1e1967529ec2edba288af786172d2b7854fbc72b SHA-256: ea4161b8667966215b80cbea108d6f11db43c68f9e105eb8fee94c26ef3302f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to lead users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a common phishing or downloader pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • 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://logisticsnetworks.net/ckfinder/userfiles/files/mafunamatuxapale.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160803bcfa5dad---91118060032.pdf
    • https://argumentua.com/i/file/madiwenesanufedalu.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740250802a2---tunikapil.pdf
    • http://wamer.org/userfiles/file/fokaxon.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/422d5b46114ca1c53679b7d08e2c529f/kejabokemururizupuwu.pdf
    • https://marathonroller.com/userfiles/files/jowimoxobibunoxuvaxizidoz.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714a12a4427---fujapiwiriwe.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607dab23dbce7---kemijujetavi.pdf
    • https://west-holding.com/userfiles/file/gejafot.pdf
    • http://cn-biyoute.com/d/files/6229829311.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607e52b0c2e8a---zasotidabirewekaxojilem.pdf
    • http://fdceta02.fr/catalogue_dynamique/file/tilebegejodeludemenusax.pdf
    • http://myexamadvisor.com/fck_uploads/files/duwetelaxewusorotozuw.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/e25a0c9731a059e189ef51c297f84400/renaxuninivirexol.pdf
    • https://kiameds.com/images/upload/files/73535379618.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f8937275dad---rofozatizivigugulebew.pdf
    • http://novichiha.ru/pic/file/zuralixurutujite.pdf
    • http://kimhoatra.com/upload/fckimagesfile/61636124738.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/9c4fdd7348b9cb78e38468a3807ee466/16159704243.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/6b5cd3e113661f778c4574b54b7e7e3f/56127644710.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/acfcad66d7ee59f591cae43b6f0c78fe/51199564184.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/07u98hp3e38j1urcq6pgj1c55o/44793961657.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=como+descargar+happy+wheels+para+pc+completo+en+espa%C3%B1ol+gratis
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e38c.bin
4127714b41e7aefb6e66ab31c965da6abd61bcdd42665fd2d95584fc3be2b1bb
pdf-font-stream PDF embedded font (sfnt) at offset 0xE38C 19212 bytes
font_01_sfnt_off00011409.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11409 16792 bytes
font_02_sfnt_off00012c20.bin
35d8a9bcac6e46a5fa1d6cfe31eeda1d83840665924fae8fc9a4e045c445d773
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C20 11396 bytes