Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d39c7aa2851998b…

MALICIOUS

PDF

91.6 KB Created: 2021-09-18 02:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b57ff5c25667c95b6dfb503b5672fefd SHA-1: ea2d7119b7b414415b683f777f57dbf57ea33517 SHA-256: 7d39c7aa2851998badfc8ffa5c1ae2f24eb02d6b7b5f894d062b837d1a18c6f5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nomylo.ru/uplcv?utm_term=structure+of+a+tree PDF link annotation
    • http://www.psoealora.es/ckfinder/userfiles/files/76916933795.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/45095829155.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/jugosaxiwovekokedipogi.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/s0vjumnq9aupn2h39ooqgplu8f/noxakimewurawiku.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/suvadumaxapamewuwujuvu.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/suvubokoxofibateko.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/temewuzawanego.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/24774371132.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/52337097021.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/d8dbdafa5bb211d80dc1cc709fab126a/25944894650.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/87403528134.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/81561121996.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322763964cb---zirep.pdfIn PDF document text
    • http://rubensova16.cz/files/file/60131105316.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/8906880451.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/14671754527.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/19526413765.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/79489410405.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/fopabufux.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc2b02528e---nenukaloxe.pdfIn PDF document text
    • http://letdentalab.com/img/files/jodemilimibupixo.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/63348203944.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_off00010587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10587 17328 bytes
SHA-256: 3be75907e03a45a505bbcadccd7a7d265a97c4535e37f013b1e25a67133f84e2
font_01_sfnt_off0001329e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1329E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AB5 10092 bytes
SHA-256: 83e761c4751bb9b95d9e6272eb8e43cd78b850788f67e1db1b1b9c062ea94882

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