Malicious PDF — malware analysis report

Static analysis result for SHA-256 71db7c90fa2f8f25…

MALICIOUS

PDF

84.0 KB Created: 2021-09-14 14:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 12f6f118cec10e015f2bff6d689e5eb1 SHA-1: 65f600fcf62b5e1c063bf1c84e3cfa73b9d90a3a SHA-256: 71db7c90fa2f8f2531ac46b58c8f402b91ae7ad7e85f24b856ce0da0681906de
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for delivering malicious payloads or redirecting users to phishing sites. Several heuristics indicate the PDF is part of a link farm, with many URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to obscure the final malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bcbc3399.com/upload/files/93022053530.pdf In PDF document text
    • http://plnjl.com/userfiles/files/fefumipam.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/56206017122.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/zepibakonafopafuwun.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/87331588760.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/55308272618.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/tubazezujora.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/665bfbf24a47c059eee819872180dc01/wujusivo.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/buzag.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/sifevij.pdfIn PDF document text
    • http://guide-eq.com/userfiles/file/20210908161107_mz25j6.pdfIn PDF document text
    • http://anpharma.net/upload/files/97071557396.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/d28ed8a977de9bb5c9c19aa4d06071a9/83191112292.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16138ea247998d---vitisotedilegelerin.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109010224494631.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/xugazepimizozojaparebap.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91521824887.pdfIn PDF document text
    • https://koparieshorvathbusz.hu/files/file/pewexititetad.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/38936938723.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/furageze.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/lomerotexezamudulu.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/10759746822.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+make+an+a3+poster+in+wordPDF 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_off0000e3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C6 10848 bytes
SHA-256: 07c8ac32f5092ff9126ed6171b789b3e6192d5843d4eb76fb6fbf6c3dbba4994
font_01_sfnt_off0000fcdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F1 17636 bytes
SHA-256: 8a42c5ef651638f31e0da22bcfc0630b91a7aa986a902679ceb63c84508e20bf

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