Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e7ba887fe9c6a96…

MALICIOUS

PDF

92.3 KB Created: 2021-07-27 23:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a5ff442e6b20a2df23da85a2f5997823 SHA-1: cfc61d7b2b3592386cc28be8eddfdd95515c43e0 SHA-256: 4e7ba887fe9c6a96cb5ae30d563bc246c4f72ed8cfc05f91ee48725d78c9d51e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/14feuvcvq158pdfk5rm3ufdghk/92030350913.pdf In PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/guzerukofivuziru.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/bajokapagopana.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/9b69aa57eb4e746105e6860b59fcd673/modewubotesutudi.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/linevuxa.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/tazomexekeroxulezab.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/466a9893828e791dfb844f27b46f4834/76481613051.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817f9b8a6fd---43721531717.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/wufadeda.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080881adade2---ketexojifufosu.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/27302517937.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16078f38c50a2a---nudatajonibetoregipezoseb.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8af8db8a5d---mesanuroturunolexo.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/1e00bccd3a3666705349fd6e15d48308/gojewedilufotimavovu.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/5ff6580c4dd24758bd5992bb8f1b6959/91195520177.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160863092646ec---83130480698.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/bd0c3f6cf3475af12a96b85287f1e2c0/sebomag.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a79fab33d65---welerizajavoxeliratebex.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/ooqllar3i8apk7v00nk7386376/fedenoxobov.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee7cda229bd---2743060808.pdfIn PDF document text
    • http://lyjclinic.com/ckupload/files/43172842234.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/gopegipawixebosagonudojud.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1b1cd3f8b---furixevawawu.pdfIn PDF document text
    • https://tmtteks.com/files/4325476412.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=apex+legends+hack+free+downloadPDF 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://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_off00010473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10473 17364 bytes
SHA-256: 7f615faf5e5692e702e2b5d72137f78df2f0ae5bcfec0713c895093fd02912fe
font_01_sfnt_off000131ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A01 10968 bytes
SHA-256: da4937e1984416a034a412209f1cad14ab7953f5557415058ba2d640f401bb37

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