Malicious PDF — malware analysis report

Static analysis result for SHA-256 d46ee74e2f01cd73…

MALICIOUS

PDF

71.5 KB Created: 2021-09-12 20:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6de3318c7c2caa5d214cba76f65f85d4 SHA-1: 93d034435cbdded647f9dbcb4f17b048d85f50be SHA-256: d46ee74e2f01cd7390e55576639dce9e6d67f5962cc659de82a43c9ade7026c7
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

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 https://robert-zauer.cz/userfiles/file/78382036594.pdf In PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161344b953aa58---zenemebifuguxepora.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/87920802271.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/96554995123.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/58025783980.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/86939553064.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/b38fce6c6cb42b665e4d11bd9e27d75a/jenomarele.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16132d4a96dad7---39843126006.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/jezetimisutometo.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137bc93c70b4---pumuzobup.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/tamuxosir.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/xivitefujizuju.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/76914183368.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16136c39f83b16---55913104947.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134e59ae437a---fimosowimabetawigetiji.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/sijurudisejij.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/69846464335.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/koxadubutare.pdfIn PDF document text
    • https://healthtecindia.com/userfiles/file/tetujafune.pdfIn PDF document text
    • http://selidbe-beograd.info/files/81970334567.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wibir.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109091933391001.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/94844757521.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/97559944223.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/rakutilibeke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=long+words+starting+with+hPDF 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_off0000b5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B3 10392 bytes
SHA-256: d6dca74faa04acff90e57d79450434555fc68da5a5f41cb2d10ba0c796da2d3b
font_01_sfnt_off0000ccfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFE 16840 bytes
SHA-256: 916dd9f4ae9d12b9effb7eefd375752bf578d73c6d516676f1b025c4f132dd16
font_02_sfnt_off0000f884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF884 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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