Malicious PDF — malware analysis report

Static analysis result for SHA-256 26627eafde6cc9c0…

MALICIOUS

PDF

143.2 KB Created: 2021-08-02 09:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: db696e5d026dd7dc1baf3d37cd41c24a SHA-1: 7d08ee17ef7f9c8e9dc923b54b467fb9939326e2 SHA-256: 26627eafde6cc9c07bdb8ef96a34d44efcd5cb6aa48e75d4bc0e7d521297aa3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised WordPress sites or disposable domains. The presence of these links suggests an intent to lure users to potentially malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9772

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://bbpartner.cz/userfiles/file/41295526797.pdf In PDF document text
    • https://angelsforwarriors.org/userfiles/files/mixuxekuserud.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/18782291169.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae75703d72---51258160614.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/52a445837aba2ccda444a757ca1f5203/sufadoxopidupowepox.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021071222310152.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/37a2c0487da404bcb2d85768bc645941/78352444380.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e782913a271---vovejafevetigonakewajuma.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/de188855b49974b119fb74a349091d7a/89564549180.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e8eb5e62537---siziwurojadipabigowij.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/17683649154.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9136b3481---13010303932.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7e49cb443---72391895759.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/koluzadije.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/kigewujuzap.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/36688754962.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/5c7ac1174b6d5ffaa953832cf8577f1c/579419805.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/54767351607.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/55194387795.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/66326509442.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/kusotesidogaje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=analog%C3%ADas+ejercicios+resueltos+pdfPDF link annotation
    • 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_off0001d491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D491 18632 bytes
SHA-256: 43f18d4557b48f02bc3ed80cdf5fe04d146155c1400914a38f1e8e60e20959e4
font_01_sfnt_off00020357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20357 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00021b6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21B6E 11068 bytes
SHA-256: b474825b3d76aab568ce4f2bb30f04b2f10b6142ca6efafbea9f6d0aff69042a