Malicious PDF — malware analysis report

Static analysis result for SHA-256 f70cbe0c5094882e…

MALICIOUS

PDF

240.7 KB Created: 2021-05-10 03:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 79abeb655acea9049c65d8d297c0b8b1 SHA-1: db0e590e30e30f723add801b1d255be1596b5410 SHA-256: f70cbe0c5094882e0decfcfae45cbdac85c7b708840f2645603d0749d69cfff2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites, identified by the PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the nature of the links suggests an attempt to redirect users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9867

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.
  • 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://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6945e6134---54915961471.pdf In PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/0039499cacf11ff1111efb0b7d4c7a77/jafinumev.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607069fccb7e8---wuzanomexewewuj.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/67455124543.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/c6194c8679e22ce3bded58307d57e9dd/38609526945.pdfIn PDF document text
    • https://t2sc.me/userfiles/81534410731.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/a1829b2cd8c62b41735372af32ce0a6c/likidofawoziroxot.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608409f19a43d---kijix.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/fawom.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cfe52dc42---92015181456.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608653b755c2f---tamupojusaturapuwafisalov.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/5mb07ljrcrcn3msrb1tkagnis7/85352627088.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719ada786bc---jerixixikirokuvogake.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/a4cc826dd9a564791dbab157e44d9950/69294696002.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebfc2ec508---fobetemawuzejujawudolo.pdfIn PDF document text
    • https://ottenburger.com/userfiles/file/74387980948.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=herefordshire+council+highways+design+guidePDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000377a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x377A8 5436 bytes
SHA-256: 07ba7466c431e2dbae50c800d0b7c44c82e9c414468f9eae271f0237fcb39439
font_01_sfnt_off00038a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x38A3A 11496 bytes
SHA-256: ace81d5cfc58eb9b5ff4c894b0288d538b654b58d5c7fc6f5431fd2addd81ce3

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