Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bf626f3d86b27cb…

MALICIOUS

PDF

91.0 KB Created: 2021-07-26 09:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 453b21afd0152525653fae8eb828027f SHA-1: 12ce3c22929234b48d5ffbe498ad2ae0303349c1 SHA-256: 8bf626f3d86b27cbd8aa4805e84c12a4634657c8c3138ecc82f58ac83e263f0d
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised websites, identified by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests the PDF itself is a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://marinapogon.pl/upload/file/37653034862.pdf In PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/ca12spchns1564mb9aqes31bp7/18985439418.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/5bef1545a9ca7db8b98dd12969423b05/55866088793.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/7422680350.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/29561363496.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/ganubijisexokuzoxo.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/88381118042.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210607090334561.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ctlrmmrfhbkaic26so63cbeb93/kifalimu.pdfIn PDF document text
    • http://vuadiemtayninh.com/hinhanh_fckeditor/file/90048010945.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/aeedc9ebbc73650a8a0c622bbdd34493/xomezujetelekaxiw.pdfIn PDF document text
    • http://randalljroutson.com/clients/44711/File/malojijezuxesunenor.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/16501879171.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/vejalenolegamabaravevusa.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/46597020494.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/07211b8ad1838b1a44b0b9b50b5643e0/tivejobowonazivupi.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/35216869044.pdfIn PDF document text
    • http://anjilh.com/uploadfile/file///2021050217065317.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/sesimotevarero.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/tadijafetoletiwemulutidi.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/vinudofovipo.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ed8730396---90489737634.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/71446051444.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+do+i+register+for+nimcPDF 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_off0000ff46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11758 17108 bytes
SHA-256: d6f5ec10af5a4817ef76e8bfbe9cb62233d14a7572a58533f04ef2a8cb8c758d
font_02_sfnt_off00014438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14438 10688 bytes
SHA-256: be967aa6942d0bbd90bce1dce58cc174afec3ad060d7f8b4b7ca242ba12991db

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