Malicious PDF — malware analysis report

Static analysis result for SHA-256 86680e28050b67d3…

MALICIOUS

PDF

92.9 KB Created: 2021-09-04 11:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 29b73deda439fc629eed93987049959c SHA-1: 59f23fc70e7c568e33588ee95ad4e5e4e8331332 SHA-256: 86680e28050b67d366cefa6f0c531f11e05d28f8285503a4f93f61c50501545e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious redirection techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pixomot.ru/uplcv?utm_term=how+to+write+an+essay+worksheet+pdf PDF link annotation
    • https://guijek.com/userfiles/file/punonukukavir.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160c76e52356f8---fozuzanufoleburim.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/36893061097.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b951345f---fibadavalodetetovigar.pdfIn PDF document text
    • http://modern-pro.ru/files/file/58031168416.pdfIn PDF document text
    • https://akemi.ro/hirek/file/48202302001.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a1b6894ba13---46403267802.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/22539059719.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/wapezutexuximovol.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102b430a92bc---buribikemabokibivotusiga.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/63595220011.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/vepexusuxuf.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4af3d5354c---26541992299.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/disegegidegipovupebedamox.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160f9ccb24d758---vomemofavo.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/lewesuputimu.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/6728663f72c17788c98b240f0f4f352c/mogutozam.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210613191304_owomrm.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/60021717412.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/kowawowigagafosodibo.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/973200027.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/4f85d1b3f1407eae9624e3036d8bb8d1/noradalawu.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_off000104bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BB 18600 bytes
SHA-256: c0bd998d4ece08707ea749ba43baee98dff4b4a7c88e8d268257c1d86601b812
font_01_sfnt_off0001349f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1349F 10832 bytes
SHA-256: fb3ac5e4fc85bdb120b6c4a728b8ed5482943f9604d8c98677ee5564c680073b
font_02_sfnt_off00014d9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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