Malicious PDF — malware analysis report

Static analysis result for SHA-256 e591b32c9f4cb5a6…

MALICIOUS

PDF

104.2 KB Created: 2021-06-29 10:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1126a6959d557c5f80bc2926a7a535fe SHA-1: bd81b187b574b928e671df1edfd683db30e756a2 SHA-256: e591b32c9f4cb5a61ed0332c82fd4ee1960b18281d4345cb22b24b5f413bf4a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing campaign, likely using T1566.001 (Spearphishing Attachment) as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://medvor.ru/uplcv?utm_term=confluence+requirements+management
    • https://amblamy.ee/upload/file/65288605267.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/1a947dead350f74f8318d702865241ee/sotovezisovoperumifumagok.pdf
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/binokupusitalex.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/4n5ofmqihfgk8lg5n4cnq80mps/17595465699.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/763933b934e71f69caa8136b3856c071/23638832951.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/a3fb7a082213636f8b528bb79d6ecfc2/dusegujewatorewukapafet.pdf
    • http://sea-cruise.ru/ckfinder/userfiles/files/situmitujekuso.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e66f814e6d---kufevepamifoloboxaketaj.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/41105830198.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c03318ed879---51162716359.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4j416eo6e9cfqgqdsbctui8c72/97416662759.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdd52d4194---96958818722.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/cca287e8903a1dea70b1a32d68860015/lobufawij.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2eb83d4693---47910258744.pdf
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105100421454417.pdf
    • https://nanyangtextile.com/userfiles/file/21519329079.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b324a2d75e4---jogosasovideloburirew.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9b399400d---kurog.pdf
    • http://novichiha.ru/pic/file/17462359502.pdf
    • http://busankid.com/webfiles/board/file///59296954185.pdf
    • https://petrovsky14.ru/docs/files/80261107184.pdf
    • https://camgloberealtor.com/userfiles/file/58047282715.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/6b063657f95f7f908f64488552819f0b/69093411005.pdf
    • http://renovfab-menuiserie.com/userfiles/file/ragasawowojivarowu.pdf
    • http://skolicka.eu/foto/images/file/kuxojaxobagaj.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_off000130f7.bin
a2714efd705049d6b428fbd0cd57f64c695b6cf7329b01656654fee21a291fe9
pdf-font-stream PDF embedded font (sfnt) at offset 0x130F7 18504 bytes
font_01_sfnt_off0001622e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1622E 16792 bytes
font_02_sfnt_off00017a45.bin
a00050ca6a76c3a9884fb8723d7f23a3dc027e7b2f938e7e38a2993792b7ca73
pdf-font-stream PDF embedded font (sfnt) at offset 0x17A45 10956 bytes