Malicious PDF — malware analysis report

Static analysis result for SHA-256 127253b76f7ecf0a…

MALICIOUS

PDF

83.5 KB Created: 2021-09-01 10:29:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bffeedc55d0f7c7d5fdccb3f7cabceaf SHA-1: c73b5effacb618fc4161980908eddc7832a63b25 SHA-256: 127253b76f7ecf0aadb36ba02c1a8c24b251a5f8a031b762dbb777168348be87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 https://crewmak.ru/uplcv?utm_term=periodic+table+easy+way+to+remember PDF link annotation
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/ca5b64621d5e68a30d01c20bd40790b3/30137292513.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/77873012921.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/67745219866.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/18077944739.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/aejb3v2dnfebja3mlrcopajed1/rozanatupimozavop.pdfIn PDF document text
    • https://melz-feu.ru/upload/52102176468.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/7843631953.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddf88db4bf---weduxulonozosexajino.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/c67d0870d9769ccd58b94c24111d223d/desedobolukudo.pdfIn PDF document text
    • http://wghsclassof69reunion.com/clients/b/b3/b33699c65747f61a54cd06c2fab73d22/File/dabub.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/fodalofufenam.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/dixonakarujulimavoj.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/b0f5c9115af41551b3e8513dca9b5b43/29466343156.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/470525669.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d702e67698---mezerufudufaduvib.pdfIn PDF document text
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/pifiwo.pdfIn PDF document text
    • http://101balkon.ru/upload/files/79683830725.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/jutarowipozebejalaw.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/59770124917.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/tazavevizajetar.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bcfb71250---zesunuposewidimejuw.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/ec48acca24fa408d2e78dfd109b28cd9/14192774421.pdfIn PDF document text
    • 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_off0000e093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE093 10768 bytes
SHA-256: ea65ef687cce49cec13ed3d2ae1a348cf92424451acd35c8fadcc1e908f79cbb
font_01_sfnt_off0000f971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF971 17984 bytes
SHA-256: c3b68d2811e2555b0b1917e675b0043d0a5d4ab875708a5ea00a1f9cfe4af730
font_02_sfnt_off000127e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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