Malicious PDF — malware analysis report

Static analysis result for SHA-256 b97d43d8466b685b…

MALICIOUS

PDF

73.0 KB Created: 2021-09-05 23:34:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 944b0b2f194708191dd05137a39ed51f SHA-1: 27d2098f88cfedae66349b458fe33d569a1c8926 SHA-256: b97d43d8466b685bd9d1b10a506fb80fef7b133de8adf5e1f9351f79dd662bb6
164 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier with high confidence. It contains numerous embedded URLs, many of which point to potentially compromised WordPress sites or disposable hosting, forming a link farm. The presence of a 'download button' heuristic further suggests a lure to download additional malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://riceart.ir/basefile/files/pugowi.pdf In PDF document text
    • https://prosaison.fr/userfiles/files/goxufojotibaj.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/In PDF document text
    • https://hanedantoptan.com/upload/files/vemosadurowi.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/36965571787.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/32695274471.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/8680061357.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d37a792eca7---jaluwan.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/66272845585.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c145d06b85---19206580173.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/jevezitoxawinojunif.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/161040c1478383---11403061725.pdfIn PDF document text
    • http://homesunshinepharma.com/upload/files/pijubawitadumozipowafaf.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a245ed22d---jiwugiwilod.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/nujizibolanumekaxarepopa.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4db131bdf---89520400152.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/57900916354.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/236ef5288a021e0f113284d53dff319b/dodirowepozimagilu.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/tosetajibizapa.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d74ea883cc---wobisediluwawisef.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/6fdbdeb407a16709bd5259308980f169/97248388042.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/ef90a7cef1e3fa5265a35f9013f71c8d/papolevirawijiwulafiwu.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0417303413---30533589751.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=ncert+maths+class+9+chapter+7+pdfPDF 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_off0000bb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB3A 16352 bytes
SHA-256: 9857b34c69b646637f750eed8107c41f4a0d7580f1946dc031a7890d03ed804b
font_01_sfnt_off0000e530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE530 10764 bytes
SHA-256: 6e9c3b1df976a95f2916b5131fe6020a9c2df7fb3972982381112f45597a9db1
font_02_sfnt_off0000fe0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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