Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9a25a1181e983ac…

MALICIOUS

PDF

80.4 KB Created: 2021-08-21 08:11:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: b4e750c1fbac219436b1df207b99bf57 SHA-1: b53936a60aca3cc12c384aa9cd98ab06616dceaf SHA-256: a9a25a1181e983acdd1bfddcbab66b575ba26a275444e9f18656121de18f858d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF that contains numerous links, many of which point to potentially compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://dagmar-e.de/userfiles/file/7155306971.pdf In PDF document text
    • https://alrukn.co/userfiles/files/28434412806.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/dinupojinuruzujisuvojafa.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/vifikiriwutovowovolutezi.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/96667272511.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/99650991248.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16078218e50f0b---97667623594.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/susodiborawigizudijered.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/56643294414.pdfIn PDF document text
    • https://0900107678.com/upload/file/fulupijalodana.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/dsa60j16rag6pcuksgi0a747i3/39741174051.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/vowuwogejeninifopon.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/mitiboxa.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f0135ed538f---vetumi.pdfIn PDF document text
    • http://wurbs-hanau.de/userfiles/file/kivananukitoj.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/8149d43232a8b93ef8228153038a6780/45324911156.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/58351570688.pdfIn PDF document text
    • http://www.kammerpop.de/files/file/movikafo.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/11333547312.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/nojiwatebixubud.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfabfb447e---42131735903.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/mflh9evqna0c9ss7ukbc9pdnrv/balazituvopibibar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=fichas+de+las+vocales+para+imprimir+pdf+gratisPDF 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_off0000d1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E3 19016 bytes
SHA-256: 9e5ae745916bcad3bec9b434ac22365c89656ba848c845aaa0ece7411ee01d56
font_01_sfnt_off000100d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D9 11004 bytes
SHA-256: 610369b5252b2e4e0ff59c6b1f347c071a7368dd64a58e29bedae65cb027db57
font_02_sfnt_off00011a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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