Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4fe7c7324a512a0…

MALICIOUS

PDF

77.9 KB Created: 2021-09-23 05:10:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2e2d50cf4f974bea79b1711f9d0b4eed SHA-1: f7bd1ec9a2135ec7bcf0adab310ed593d76507d9 SHA-256: f4fe7c7324a512a00741817a19cfe2c719e4acadc61e7ca8c54a9f81aeaa62f5
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress installations and disposable hosting domains, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or further stages of an attack. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://robedecreateur.com/img/files/33357657444.pdf In PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613614407719e---34558065659.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zegekipupasafelubulizik.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/44456133027.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/96190169020.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/34712271955.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16130951d02687---tosomo.pdfIn PDF document text
    • http://infas.cz/images/wiswig/file/firezorisitisofomige.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614ac995ab469---marazukozemegamogebuv.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/nazonebidos.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/14786251668.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/kesitagokogefudikakop.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/85552180003.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/wisurop.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/naneduneduvikegoguwupo.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/376adc9cac7b90f2b0bde9565c006c30/16374351287.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16133c8ece55d1---13555021419.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/sisabo.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/womadadimerugisovipixux.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/85126843861.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/279370313.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/jexojolomeduxir.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/16170079372.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/53033084660.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=bedrock+together+androidPDF 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_off0000c242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC242 21928 bytes
SHA-256: f13bc45de1ccd90e208766c75d7aa1f1a454c3c0999d43e9192f2d9d866fc040
font_01_sfnt_off0000fa8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8F 10580 bytes
SHA-256: fc2736e5d232fe561ab2e8ef1c0ab12c5781ec93fb115f7e74afab244084d72f
font_02_sfnt_off00011273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11273 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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