Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ece54206a1c735b…

MALICIOUS

PDF

95.5 KB Created: 2021-07-19 20:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c6c7c73b7cdc76e3c665e0cea535a14f SHA-1: 74fd1483681ad263e37181b3c7c542d2b770fb24 SHA-256: 8ece54206a1c735bc7da1f4e95f5f5fe44ad12e3933d940f82a74788d65dcf15
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous links pointing to compromised websites and disposable hosting, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the final destination and leverage compromised infrastructure. The primary attack pattern appears to be a phishing lure, likely delivered as a spearphishing attachment, leading users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc405bf666---fosuvogugomoxoxo.pdf In PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/6969a65c622e97dba108c60cf63e8de8/96204066874.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a75aef01e5c---91579401916.pdfIn PDF document text
    • https://ivanamihic.com//files/zoluludase.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a8e517db5---19608177077.pdfIn PDF document text
    • http://baovevietnam-vnss.com/upload/file/57635906091.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/b444a2b608afcab36642770e6ac1d132/8101545891.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/e0c725b7e05eddf299780607dd7c737a/vaxobugupetapilonanonuv.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/16344673365.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083bb22c1dc2---xozanu.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/xakilifakuverulomamoxe.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/zibuwetibexujagu.pdfIn PDF document text
    • http://littlebarnct.com/ckfinder/userfiles/files/naxuzitimop.pdfIn PDF document text
    • https://aspirans.com/files/file/71234872699.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608acede312d8---89189124639.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/a1e4d4dp535ho9r4phq39l2647/xeliveponamimofanojaletef.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d20c8d36c---nixawuze.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/40263159969.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845f98ad87f---43127500868.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbc47e3c4a---jukevapaziz.pdfIn PDF document text
    • https://ckmandarin.com/uploads/53431073640.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160738569ed627---tibanaz.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/52926861460.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/44884754620.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=structural+welding+code+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_off00011114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11114 17080 bytes
SHA-256: c4c8bf130cd32e2cd9010c4f917014d4ea75c636b84b8856cbd313162b3e71ee
font_01_sfnt_off00013db7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000155ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155CE 10888 bytes
SHA-256: f44160f2486272345202534951e9aadde146271d7822d2962aed91ec84e39095

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