Malicious PDF — malware analysis report

Static analysis result for SHA-256 e72af5ad9c18db78…

MALICIOUS

PDF

92.3 KB Created: 2021-08-07 17:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fadaf21c6c6263395e815ac6c2346aac SHA-1: eb4aaadd8dc127bdd7a767465c294daaaed4106a SHA-256: e72af5ad9c18db78932d0774f7112084d975e814223ab193330b3e841468291a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users through multiple compromised WordPress sites and disposable hosting domains, ultimately attempting to lure them into downloading a file disguised as a calendar. The presence of embedded URLs and the nature of the link farm suggest an attempt to obfuscate the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/kpc8kphuqseuijvlcpej8c6b58/53060732096.pdf In PDF document text
    • https://everestart.com/images/stories/file/monifalijenuretufa.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/69305401446.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ff4e0ac7d---80015123657.pdfIn PDF document text
    • http://goldia.cz/data/file/rawugi.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/mukirefu.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a194a8b50b2---wipanagesegibu.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a98aa6261a8---goxusufos.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/bokizagibobujexogekidem.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093f6f6b5ccb---duluvowum.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/fixafax.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcb9b8e78b0---64825769277.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///51086636933.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e7736e8d5---15262709721.pdfIn PDF document text
    • http://christopherdallo.com/file/nanodufobitafumedosozovil.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fc1ecf2e8---napifesobixarudux.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/13162454373.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/11048870218.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/xidudapusole.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a49b27877---75047038920.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/425253f13ddd7d0d7c47e610006d2714.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=kalnirnay+kannada+calendar+2020+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_off00010422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10422 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C34 17592 bytes
SHA-256: 36bee1987c995c44d6f5984196778e42774a001b04f860916e05c28f7adc7747
font_02_sfnt_off00014a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A60 10664 bytes
SHA-256: 08c90124d08e8a688d2979b598c525f5226dbccd7a1da6f9518a1a0635d1ae91

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