Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee1ee48070968e23…

MALICIOUS

PDF

74.8 KB Created: 2021-09-06 13:13:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b1d911812148f6b4492154960557e2d7 SHA-1: 51de11a7b9b3ad63df2d44efb2ba819a5592e7b7 SHA-256: ee1ee48070968e2327de9d1e6d630c2d6b25fa2eb5d91be1ee3fcdfebeddbf2a
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to lure users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://thephinhmienbac.com/upload/files/60874215938.pdf In PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/43723569096.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd42b2b9ff---18165621171.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/65162933600.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/62581446773.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/kuvilew.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/82504981840.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/36985660103.pdfIn PDF document text
    • http://vanhacollection.com/images/files/gajozanof.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/5491591576.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/83555942489.pdfIn PDF document text
    • http://parquessolaresdenavarra.com/userfiles/files/95166186128.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/59512159576.pdfIn PDF document text
    • https://ip-pharma.net/data/files/29294375658.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/difafevusonelebu.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b17e7ea45---18279498646.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/84499897345.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/basux.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/9155967117.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/808e66980b7648c61759f738528ede56/boxoposowoxiwo.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/xituzexebizu.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/39991097288.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/55dc22c5acf52a00ee77360acf13aa5f/dipidufirudusokex.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2978cf81c---56093767881.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade494e527d---63719330047.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=undercover+economist+pdf+downloadPDF 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_off0000bf25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73C 10940 bytes
SHA-256: 90f0bac7c17c6a8dc344bced9677f5ffce04afca7cce2932961c4ba918eef3e4
font_02_sfnt_off0000f099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF099 17400 bytes
SHA-256: 17376bcbcc2bfaa2ecf845c44a3f586212278511d086aaae7975542e47c9faa9

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