Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c4b53477e3140e9…

MALICIOUS

PDF

85.7 KB Created: 2021-07-03 09:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad738b38831bd03b26abd1962d9b40e7 SHA-1: 62c84c53d05c8163ade13f14300927a1d58e5163 SHA-256: 4c4b53477e3140e98be426787ee9b3c8cc7bbed2bae0965f4f0123c4c07513f3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple PDF files hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were directly extracted, the presence of numerous external links and the nature of the heuristics point towards a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • 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://446888.top/userfiles/file/79213625857.pdf
    • http://amuseonline.com/absite/userfiles/file/28091173911.pdf
    • https://accuratesearch.com/userfiles/file/tudubifeperitavu.pdf
    • https://ises.ca/phpsites/vertical_living/uploads/file/ketot.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3239b60fe---5049173421.pdf
    • https://tranduongauto.com/app/webroot/files/images/pages/files/19180469944.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a89d98cfa---zujusukajodigonoxevupimo.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d94bc7d7---zosifevamokodepubenexu.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d7096a5e062---16005076533.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a708b425b---pazesizasiwiraziruji.pdf
    • http://tortsurprise.ru/upload/redactor/files/warisajukibawada.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf7ba89bf56---63210175116.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16075ecdf38290---97599424668.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11a98817b2---66862570235.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b02cf086b9---kafelixepejesegegaribi.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/5fht0ov0mvqsj2rfttjk438o6v/gudazegokijekodum.pdf
    • https://prokoncept.hu/admin/blogfck/image/file/78024688063.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607248a86a556---43942882920.pdf
    • http://huthamcauquanggiap.com/upload/files/84886884610.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606dfdbd64460---98989701373.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=chemical+reactions+and+equations+class+10+notes+pdf+download
    • 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_off0000e9dd.bin
dfa2a0d7de60619e7ffb3d3441ce85c5b465c2fae145190d3f15911cfe9e86e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DD 17004 bytes
font_01_sfnt_off00011695.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11695 16792 bytes
font_02_sfnt_off00012eac.bin
594ba9b1f056a1866cef2d8268e6b973aa800ebf15db960fcc21ebf8aa608ba8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12EAC 11420 bytes

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