Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a8ca16cef27c0a6…

MALICIOUS

PDF

97.8 KB Created: 2021-08-04 16:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0d1c57e7b2fc62e9bbf00cea38bf5bc5 SHA-1: 503188bf31d486c1bd5f4a06dddb64305c64f3fb SHA-256: 8a8ca16cef27c0a65eb1bda0dd9734d7ca41ba9a854783ddfbe5e402e5799c27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/0ddf0d9ae89ab9ba0f84189d8bc11f20/fatene.pdf In PDF document text
    • http://zhuoer.ltd/userfiles/file/10787216941.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/1b4dflt09n8q7llrhselkov530/12662022802.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/wetujaburoropi.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be3c7e97bfe---balonalow.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/df2d2fb13c2132a3ca8e03d5abda8719/10655461993.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c55a72cbf---vixizixanomebopuwed.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/mujudodogudabixed.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/73302380532.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/fc37cfba95558ed7aab08509dd092e8e/30637406734.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e92ab38d549---32809007550.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/kejoxapifuzekadafot.pdfIn PDF document text
    • http://debden.org/userfiles/file/47786231155.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/xotaxuwizoxujag.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/83690847703.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/runote.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/romoragagusitamapobaduma.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0a6f602ce---66916853793.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/32935656542.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e98358e5f38---53348030945.pdfIn PDF document text
    • http://stromzeleny.cz/file/weluxizu.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7c8db1b5d---15558140832.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/9067531fb6e63badaef5fb6f5aba738d/20676060484.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=what+do+cats+symbolize+in+egyptian+mythologyPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/a5250c8ec27e477e66d0358287bbe0e3/ruwezuwapoxene.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_off00011422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11422 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012c39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C39 11168 bytes
SHA-256: a05c98b47964aa95f32cb9c94e576d7a6da0e006791d1062453a308accb092f2
font_02_sfnt_off000145c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145C6 19528 bytes
SHA-256: 47c124f585245fa0ccfa6a83da9234248fd23ab51e436ba2442d414ebe9e9962

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