Malicious PDF — malware analysis report

Static analysis result for SHA-256 13e6c6ac69e02e55…

MALICIOUS

PDF

86.0 KB Created: 2021-07-13 21:25:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b360db9aac035d48571214aecc884234 SHA-1: f2c2ca5d04b5aa990493b120f84b9f005012ba4b SHA-256: 13e6c6ac69e02e5545f59017f0d430fabafac1d6dc5a7d822fddaadb4b5b13d5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://cructi.ru/uplcv?utm_term=after+effects+spectrum+visualizer PDF link annotation
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/8b49c7df022de5b36edecba0e3561bcd/nazoguzejajiwavoragopeleg.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87347202666.pdfIn PDF document text
    • http://vangphugia.com/userfiles/file/sopoxibifegerosedu.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/2d15087b77649b01ec935fad6109e882/gobopokafifujujugituluz.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/70236518683.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/12788459758.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da94742692c---rifopasarusenolaga.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dde118234---75162725124.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/pehvhc51ffjevuhjsqlo5po483/vifuladugewaweputixasu.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/6b2df84cd3ab0b21d297363c1fdaecf2/zudupepaboguwe.pdfIn PDF document text
    • http://dzbnf.com/upload/file///teponelaniputimudujij.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/20779367071.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/devorux.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/9881948956.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/c1qoeolf74h6ee75igf39ro3s7/kipesow.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a9ca344c6---ruwavenabikirojeromi.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/80603038153.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078410ea0d18---zuzujabojenuvu.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/26297331601.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090e72327d4e---85452602489.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/mezifudalanavonopikud.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/doterigomazipi.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/6nekt1a31palidmqfkn5oeveq5/16976872362.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/98997644650.pdfIn PDF document text
    • 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_off0000e8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001010a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010A 10624 bytes
SHA-256: b89f96a1e47e9e40ca2466e1941c49c61d014f10ca4598193bb5e673686e2a42
font_02_sfnt_off00011973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11973 18060 bytes
SHA-256: 2e8ace24e39c27e4b2dcb6dd4e95f90eb3f9eb8d2f264d59d7190fd6ed1f8eb2

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