Malicious PDF — malware analysis report

Static analysis result for SHA-256 3941c677dca00295…

MALICIOUS

PDF

78.1 KB Created: 2021-09-18 19:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 85e927c36d1313a749e59f0dd262fd01 SHA-1: 9105354fd3b0f0b78539620658d26e02cfd5fca6 SHA-256: 3941c677dca00295310cce8eff849866d7c4be13fad6fd33aab1a06ff11dad51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm, potentially for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://showplus.ae/userfiles/files/21494459102.pdf In PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/kiratisavagewelugorufodik.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/25231871863.pdfIn PDF document text
    • http://robbes.nl/media/files/kigagapigobafafor.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/zijulobutizazan.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/getadawuj.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/moxusudugadawotizemilaga.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/96491325466.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/jotojigulowi.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/wotogitojigulotapudag.pdfIn PDF document text
    • http://newo.ru/files/files/67741179817.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/20156117216.pdfIn PDF document text
    • http://nguoiquangphianam.com/uploads/files/41346656730.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/84640814688.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/mibidi.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/ritijekuno.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fa01cc137---31592695989.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e30f4da3b---51689513344.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613a22675479f---3958576655.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f08f89426---47500158447.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16143e1fad6b77---boxatunukadewinixiwikevo.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/pokijetujibaso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=fundamentals+of+engineering+thermodynamics+9th+edition+solution+manualPDF 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_off0000ce89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69B 15968 bytes
SHA-256: c2aebe0bfd4905acca9ab6d266952ecfc467ebf3545ed040c783f4e3d6298823
font_02_sfnt_off00010fb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB3 11280 bytes
SHA-256: 416651594f2f9cb55ae716a8213371131742ae32746f03ba442d0988d7b6f6be

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