Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3f525e719e4c6bd…

MALICIOUS

PDF

81.8 KB Created: 2021-09-01 03:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9f41e51c096e3dbc61e61f8f24aaa4aa SHA-1: 02264b6aea899b42de80c518d5da94f64ce0ce1b SHA-256: b3f525e719e4c6bde318d46e6adbbfa5bdcbb39203652534c443e685ae6c2acd
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting domains, indicating a link farm designed to distribute malicious content or phish users. ClamAV detection further supports its malicious nature. The file's structure and URL distribution suggest it is likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4718

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://stillincontact.com/images/mails/file/xitojejonomilogujobiz.pdf In PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/vifufukig.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16102d302b625e---rejukominitanenumij.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210621_0B6726EBE071A5EF.pdfIn PDF document text
    • http://greenld.com/userfiles/ruputezutarasikisunof.pdfIn PDF document text
    • https://smaransaving.com.np/ckfinder/userfiles/files/60911277291.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a919ee95961---38538178266.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8681df479---54221094265.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1610a04bb6f3fa---53211942527.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/venezazop.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/23579768716.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10973542130.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/55111801428.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/80a2952d74128fda0605344e6e8ab45d/60363274873.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/lekedisot.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/fabupama.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/0v6v4tmasi69ee1nnuh3opjete/gosukarejotomonelibusak.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/84698bb08dc478c64a8bf65e70cb5c9d/zodigopavej.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/is2us1uhmdited2s2ar4j77gq7/90269888594.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/19503125712.pdfIn PDF document text
    • http://vswet.ru/f/30788434988.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/161138d478d704---1423287583.pdfIn PDF document text
    • http://clarkstownhs64.com/clients/2/25/255c49a504cbad61718694d8b78dfcdd/File/20252119293.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/zujurofokun.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/162723438440296838950.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098866fc51f5---pixisabiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=milky+mushroom+cultivation+project+reportPDF link annotation
    • 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_off0000df65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF65 19440 bytes
SHA-256: f4f3d3f5393ea4dd7b958f8a45da33c87eb03ec8936429b474e81908e574b85d
font_01_sfnt_off000111e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E8 11132 bytes
SHA-256: 1e17006d9bbbc07faee3e0e35dd28b7a41d1dafb0444f60bb8324bd01795eb97
font_02_sfnt_off00012bc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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