Malicious PDF — malware analysis report

Static analysis result for SHA-256 36f0f1352eb5a865…

MALICIOUS

PDF

76.4 KB Created: 2021-09-19 04:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 02ae7deea4d069aff0b0731034395679 SHA-1: 04332b22499b7dcb619d256d1b64d438ddafa6fc SHA-256: 36f0f1352eb5a865c7bbc879866a4ef299436a56de3a04a993dd0c6a691fe982
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • 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=play+store+song+download PDF link annotation
    • http://virus-safe-zone.com/ckupload/files/33468748433.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614590c55be67---zevumepagizojogoledi.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/66100tmjjg8gv8gjtsqet8ok1s/55725009745.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/72135947143.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/70018420160.pdfIn PDF document text
    • https://wittnebel.dk/file/28117515225.pdfIn PDF document text
    • http://graczeonline.pl/userfiles/file/32623584413.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/warebepalipofev.pdfIn PDF document text
    • http://es-iyashinomori.net/yamituki-n/uploads/files/povulome.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/gumefed.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/ef2abf03260f6f94246ffac78a40c4bf/17481155981.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/rekazag.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/32884278736.pdfIn PDF document text
    • http://turchifiltri.com/userfiles/files/xufuzuvedoni.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/nifujava.pdfIn PDF document text
    • http://mobiliteit.nu/files/tojebunuvojafes.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/niburobuzagujatagutezu.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ibk0dklfu3r5vpbvavkhm963v6/damusuniberokolarolaw.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/10023731919.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/xasutewogowaz.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/jeforozow.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/90709227098.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/masuwifonaluluxo.pdfIn PDF document text
    • http://devison-matras.com/upload/file/41160784594.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_off0000ca6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6E 16412 bytes
SHA-256: 49ce8c888b08493e3046ab69620de467f0899085b0406e47bf5d003488c708a3
font_01_sfnt_off0000f47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47E 10532 bytes
SHA-256: dcf33bb122cbbd9016f7ed13cd8c4b0d1c0d16b07acd4c115702e8061307d9b8
font_02_sfnt_off00010c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1