Malicious PDF — malware analysis report

Static analysis result for SHA-256 751a6c35ededab95…

MALICIOUS

PDF

81.0 KB Created: 2021-09-04 21:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cb005668d3b48aaaf4affe357ffcaf5d SHA-1: 1252d00f7c090514fb6c0ccfe976e807f1b8d2c8 SHA-256: 751a6c35ededab95e3ac632d6ff53d7600ddf7713905111c3e83f3c3bd432691
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, many of which are hosted on disposable domains or use SEO manipulation tactics. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of multiple links to compromised CMS upload storage suggests a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e55ebb48d30---namijevosuronelufo.pdf In PDF document text
    • https://wolfgang-photography.com/userfiles/files/wupesuwolivinilopabe.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f65d6d0c1---diwive.pdfIn PDF document text
    • http://khocabien.com/uploads/files/79126240514.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/gizelajuwi.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b95e9b5c4---nakames.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090fe4af0780---37053532362.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/42892459375.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/0f47c68b8b677361ac28d1899ee45909/40460452964.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fc498dcbf---83240738836.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/3ed341c68d8f73dd35bd2fb97fd68760/vogugotilavawitez.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/fiximelebogotalo.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/25400595202.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/1edce3f4e5e4d297fdeee9d0acb7f925/20547316582.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/77443673898.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609659f22bcb3---97156891771.pdfIn PDF document text
    • https://luminex.pl/upload/file/lunoruzuruvubef.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/kuvisewofidenuzadevuzeno.pdfIn PDF document text
    • http://latexindia.com/userfiles/file/pomozesikulike.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/98449388797.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/e5347fdc98acd19017d023e1aface879/difaropulakuduwota.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/21440464018.pdfIn PDF document text
    • https://pathakpharma.in/singhania/downloads/file/xawobudigakudiwof.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/5945760453.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/jasinawegurepumisagija.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/wukidisawanoxibugewo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=hakkaride+bir+mevsim+pdfPDF link annotation
    • 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_off0000d8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AF 17996 bytes
SHA-256: 79b09ad6512dea4005bcd4f9d86a806b458409a4b94783a1f52a9c58bec63461
font_01_sfnt_off0001051f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D36 10580 bytes
SHA-256: ca80572fc37c51f8cf2875cfc8722f20a831b9abc678733cbe5092c4aaff6fd9

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