Malicious PDF — malware analysis report

Static analysis result for SHA-256 7375cab6af0ceb35…

MALICIOUS

PDF

74.1 KB Created: 2021-06-02 12:21:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc3e7d63e9cfea89d887b8adeea2978d SHA-1: 8a88b9a2890257ae89461e7c7f96e5ae9bde5df2 SHA-256: 7375cab6af0ceb35b1147f1730117cbdfa8df2864edaddcc0bac4fe088af90b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish for credentials. The embedded URLs and the heuristic findings indicate a clear intent to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://krisoc.ru/uplcv?utm_term=apuntes+lengua+y+literatura+1+bachillerato+pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad62287eb49---bivodejexuxigasojoreruv.pdf
    • http://eperon-kochersberg.com/img_db/14015099414.pdf
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/tujinazenazukipav.pdf
    • http://guojingmall.com/userfiles/file/%5C/larozenugaga.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b216af8302a---97628191839.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a604c065375---49801869889.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b81de7b00---kefarubanuzaf.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/60smvnq3n2u2mfg5f64ksss92n/muviwevegewinilevixive.pdf
    • https://asthasupermarket.com/userfiles/file/37691974007.pdf
    • https://benqmusicworkshop.com/fupload/file/revepowudafajanepadi.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/ah4c8mt70uh1b68433jmt60121/rowosawipizamoz.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16094a4782d993---8167363416.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/95b47edac9ba261e9de08d1c240e3d50/84447801006.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/e17i8q3s0eugvsje511hkpn6n8/95257040583.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2f1.bin
d8fc5873b93d1fcaef2d3972dddd0ae26ebf9f7ecb30e36a49c498d5b69bece1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F1 5584 bytes
font_01_sfnt_off0000e5e5.bin
86d8f3b6efd6cbaad2c0e99f537c3495272cfe4a9a7a2c2671642cdb69aafaf1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E5 11512 bytes
font_02_sfnt_off00010b62.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B62 4324 bytes

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