Malicious PDF — malware analysis report

Static analysis result for SHA-256 de8b8269478d62bf…

MALICIOUS

PDF

72.9 KB Created: 2021-09-07 10:01:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3c429825845fb74127a1297b0d696416 SHA-1: 7b48a4d6b83d8e6703defbb1508669d6c4f0fc03 SHA-256: de8b8269478d62bff7374c21f0f992430b3d5fc84a7b2c7dfbe1c6a7f86f250b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is intended to facilitate initial access via spearphishing, likely leading to further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://coretry.ru/uplcv?utm_term=cdf+to+pdf PDF link annotation
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e1040860aeb---jotevovudorimeriduviguxez.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/pipetomuxunipakomower.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/lupibuwuguzonolumebepefo.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/b1e0ea0f6ab799a00d21946decda8bfa/73538039178.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/782f41c6edf5ae0e30829d2aa093ec3e/26561955214.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/33939858354.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/95019443218.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/pubuxesobesedigutivojigo.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/90316558625.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/81c8f050b34c7db3bc2c208eea9b4dfc/zeginebaberenajuzeka.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39f9da7c4d---vilevow.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/60b067f322e1e.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/8f35cfdcfedea5c358404b74f6e35b3e/96644677116.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/guramosobaj.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/20b2cbcaa697e687cccf02c9d5adae35/62557628544.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/e3893p9n7r44po83vhsn246uqk/pulavawo.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/moxololojamavigopozi.pdfIn PDF document text
    • http://hnspkjx.com/d/files/vamifejibiguganogup.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/rojigater.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16082f200b01a7---88076278111.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/40212833464.pdfIn PDF document text
    • http://sillajen.com/fckeditor/_upload/file/zumomibibudabiwuraj.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092eda98dd4e---kusib.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/222f5c1f6e2581ad4d91dca07091b80b/56438304627.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_off0000b924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB924 9720 bytes
SHA-256: dfedf9f527e2166ea2bf2f7fb6f8ad8f42b0734a3ff6577225450bb8320efab1
font_01_sfnt_off0000ce6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67C 18764 bytes
SHA-256: 90aec9dea1481d478ff0e76c8ec3cf8dbd1a438edf655971decabb40fa191ab9

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