Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d34f7c0405154e…

MALICIOUS

PDF

78.9 KB Created: 2021-09-01 01:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d60563cb47510d20cce7febb5bf7319f SHA-1: 2b57e5a2f61fa450b64bd970ebda48bba7c04f9a SHA-256: b4d34f7c0405154e21fdc1daa7b6fbb1e7a5631693c08c7363a3e54e9ac69c3e
154 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including ML classifiers and ClamAV, indicating malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links strongly suggests the PDF is used as a lure for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8648

Heuristics 5

  • 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
  • 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://medvor.ru/uplcv?utm_term=dynamic+systems+theory+sport PDF link annotation
    • http://sadiqandsons.com/userfiles/files/8142183705.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/47493598580.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4a12813e3---46206148076.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/853aacdf0073a575ac0fb07eb398a17b/14861170500.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160d64c5dbaeca---92697192369.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16080d4d085f0d---redemenosofozegamitev.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160912dfecc0b0---65965865206.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/gosubafubemavuzaren.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/f432f47c4c335909e26e18c37854abe6/48916757598.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/3nkqjcfvao1r00i9v11inbtb0k/75796410695.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/fixol.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/10620914645.pdfIn PDF document text
    • http://gr-chem.com/upload/files/gikowidamoze.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/1ef7f1180baa44cedb4e266c62446e50/ritizosifixagod.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/p01vm601gaik7fqfb8cjlka5t6/83552134437.pdfIn PDF document text
    • https://yuss.it/file/77306221627.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/juxivanezugadisu.pdfIn PDF document text
    • https://empresa-venta.hr/files/xevekexebutomisibetu.pdfIn PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/watidavetalofog.pdfIn PDF document text
    • https://jetaime-shop.com/files/gimusaxepokuvexe.pdfIn 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_off0000e1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA01 17636 bytes
SHA-256: 2e6216bf0513d4781eef4b4f1dfeb922ac5677a3b56cdb397138406a0ff61846
font_02_sfnt_off000127fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FD 10708 bytes
SHA-256: e89ff72faba5e2cbc96b54162d7584a70bb10093fb9927b109ca5c5fd4096eae

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