Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cdfda0d94147287…

MALICIOUS

PDF

71.0 KB Created: 2021-09-25 13:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9a1896fa61e0834e3cc9e81945f00ea8 SHA-1: 21d6f642c5c12ad5c97c2295eea52a90115a7458 SHA-256: 8cdfda0d94147287304cbc9eea73662d9202df6c85529fa3e40a532befa5e4f4
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document that contains embedded JavaScript, indicating it is designed to execute malicious code. Heuristics indicate it is a lure for MFA or one-time code harvesting, consistent with credential phishing. The embedded JavaScript likely facilitates the credential harvesting or downloads a secondary payload from one of the numerous extracted URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://irlanc.ru/uplcv?utm_term=infinity+blade+android+game
    • http://feach.ie/images/uploads/file/kusinagu.pdf
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/53869343206.pdf
    • http://ridendo.cz/files/file/48042671285.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614ba599c079f---84299755320.pdf
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/fazovixixidotidaruvu.pdf
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/vokawarezapasex.pdf
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/foxujavuxen.pdf
    • https://cdmsig.com/ckfinder/userfiles/files/pajulakaxemuwowabupuzaz.pdf
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/fugaj.pdf
    • http://tecs4.com/intranet/ckfinder/userfiles/files/voliwoguzobanor.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/615ae2260f37480f71df88df3f79f162/70279223032.pdf
    • http://www.77ice.com/upload/files/pikakexofaxa.pdf
    • http://air-ned.com/uploads/files/xupewamuzafinejikada.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16144d2b0e193b---fewawaxagoxapowulume.pdf
    • http://szolnokepul.hu/userfiles/file/xitibew.pdf
    • http://puisan.ru/uploads/file/4995581993.pdf
    • https://quatden.vn/webroot/img/files/xefururiperaladesemoz.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142019ec059e---8076501407.pdf
    • http://www.jindatunnel.com/up_files/file/dadanexotivopojumonoxoxe.pdf
    • http://flirtproducties.nl/ckfinder/userfiles/files/72671820544.pdf
    • https://dalton-english.com/userfiles/file/52148202712.pdf
    • https://nstoplana.rs/ckfinder/userfiles/files/63512724025.pdf
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/40021056060.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b48b.bin
9e7006fd2f2bbe9996dd5ec68dbf4e94b9aad917a7bb10578eaf95dce0d4f341
pdf-font-stream PDF embedded font (sfnt) at offset 0xB48B 16296 bytes
font_01_sfnt_off0000de28.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE28 16792 bytes
font_02_sfnt_off0000f63f.bin
4c99c4c636d7b18e47517087f256b8ca870db4edf8acc05a1e966e66c5211500
pdf-font-stream PDF embedded font (sfnt) at offset 0xF63F 10732 bytes