Malicious PDF — malware analysis report

Static analysis result for SHA-256 86d9bac1057c521f…

MALICIOUS

PDF

98.6 KB Created: 2021-09-17 10:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4deeab92028ebdaa6b44c9a1d4f8e015 SHA-1: 676daa6e9689a5181b6bcb544b37b1555cd6accb SHA-256: 86d9bac1057c521fdce2584c1231bddddfee1276b6e61e21bf6aad0bc75fbe7d
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary function appears to be directing users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://turbooto.vn/upload/files/riraloxo.pdf In PDF document text
    • http://theponghop.com/upload/files/mamesule.pdfIn PDF document text
    • http://venkateshservices.com/uploads/pijeg.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/magaxawibojazorapanixevam.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5f0b6eadf---polofimudujixidixuj.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/a94f8d0c637d2ca84832f8fd49ef6593/jokoruvifewun.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/60841998017.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109111749285098.pdfIn PDF document text
    • http://jin16888.com/userfiles/file/gixidubonose.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/vetoxunexowej.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/kumumu.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/161443c66aab15---41107961704.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/d9279e.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/sobomidegigimibos.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132810e32b29---kanesifexajan.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/31094957299.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/memotupuzedaweruso.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/52115598199.pdfIn PDF document text
    • https://5703n1n6999-6a55.com/contents/files/vosasezoxuzekigufodileku.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/lotewuxiveloga.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/19329328425.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/fedab.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16135c84fb323b---dasemated.pdfIn PDF document text
    • http://packturf.fr/files/kipumikewitonabiwojilopis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=the+gnostic+gospels+pdfPDF 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_off00011e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13641 10600 bytes
SHA-256: fbda148bd82d10c5ca7d43161fd1be0b291ca6792b3e0005e921fd164c862bd7
font_02_sfnt_off00014e29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E29 17872 bytes
SHA-256: d34a56c38aa89ac01e4197a5fc2c7baee1ec477ba53b95666409962e190bccd6

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