Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6f98e9b45437bd7…

MALICIOUS

PDF

95.8 KB Created: 2021-09-01 05:20:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f29da4b2f7a1c94212faa047eb013cc4 SHA-1: 06490695027071e84033a3c0b8b372ddf420da10 SHA-256: c6f98e9b45437bd7527d8880516f9819ff6cf3a3e2acd5718bb1ff7245ab6a2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or redirection strategy. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with exploiting vulnerabilities or social engineering users to visit malicious sites.

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://archism.ru/uplcv?utm_term=rome+to+venice+by+train PDF link annotation
    • http://jgbt.us/pds/userfiles/files/83909141623.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/milonoforejerewawuvesir.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/53548976107.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/gixinanezorarufaf.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af96d9e8711---46410629283.pdfIn PDF document text
    • http://aimic.com/userfiles/file/41084827624.pdfIn PDF document text
    • https://airshow-bg.com/file/33765506125.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/70251939992.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/f75a138238f4ada9449ce6f6a0566aac/71829773767.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e19e66179f---kafukeridubadabaxawijela.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/mexisenozi.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/zifuzokiroxadajedotuw.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/negupokasadakupima.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/sevujitosalaxapabi.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/87958147042.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/53305432103.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/zurazoperutotuviwozefupas.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/aaae1ac907a41844fad4c0b9243f2335/mesonesodoxuzi.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/0a2962947be87d38463c63944e3bf5a5/1516272318.pdfIn PDF document text
    • http://secretinvitation.net/images/files/64129393773.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1607941ac7b86e---valajowunatoxatu.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160a84ede7ee9a---tenowomuj.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/97741677173.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_off00010ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED3 19428 bytes
SHA-256: 5fc0fcd152a2bebf4f0907528816d46a7057449561ad9d6bb5b2ece5ad31dd32
font_01_sfnt_off00014150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14150 10540 bytes
SHA-256: 59d30e98efc8622e996249da641fcbca657bdff84711bd53facd1ccde1cd6108
font_02_sfnt_off00015963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15963 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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