Malicious PDF — malware analysis report

Static analysis result for SHA-256 522877e583dc573f…

MALICIOUS

PDF

225.1 KB Created: 2021-06-25 22:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b864ffa5c3884be1b2cb308ff4be9a3d SHA-1: 121e869cf26a3039ec51168355518824dc9398ad SHA-256: 522877e583dc573faaa68a58221694f65751aae3161fcfd610223816bcd4b98e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a malicious PDF detected by ClamAV and an ML classifier. It contains numerous links, including one pointing to a compromised WordPress upload directory, which likely serves a secondary PDF payload. The PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic indicates a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9393

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://accessiblevehicleservices.com/userfiles/file/kinorufikitokosib.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/b2092pskvtkm03tg1tnptpeo39/16640854520.pdf
    • https://zanhotel.ro/beficientconsultingFiles/file/94642722833.pdf
    • http://expresskaliski.info/file/62533376565.pdf
    • http://huh.hu/UserFiles/File/74189458069.pdf
    • https://store-connector.com/_upload_bilder/_filemanager/file/baxalidevumubowevaf.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16098bce8e8601---4470874594.pdf
    • https://chmelo.hu/sites/default/files/file/85858308874.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/889ca56bd9625ef3c0cb2f67b9919fec/38005915972.pdf
    • http://sys-svinding.dk/userfiles/file/soxiduwugedufakasaturo.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3c47a06ba---supotiravot.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be730d3da59---guzotibodiberigerigerufuz.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072200856b7c---42307542896.pdf
    • https://whitesal.com/data/images/file/7145_20210515113802.pdf
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/bupumexipubipozojozefuwup.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3592d25589861bc558e172085c11ef84/zudesowonafitafetiweza.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c07609a36e---zijuj.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/221136c67e6e7d6b1c4d2b652105d0c8/71184814919.pdf
    • https://betenagro.com/sites/default/files/file/6792956995.pdf
    • http://orgue-chantepie.info/FCKeditor/upload/file/gigegomimajakesofap.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/05f4d8756080f2d4a8068ea9061cab37/zisoxetuvanubutu.pdf
    • http://maihome.hu/admin1/file/72318500918.pdf
    • http://studiomistretta.com/userfiles/files/5697790504.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=all+states+alphabetical
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002d83c.bin
a493cf14d42598d256b41302b6b737aafa7e6b0f151a2977567a5726682abbae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2D83C 16112 bytes
font_01_sfnt_off0002ed8d.bin
e314730e07ceedcfda529bae10119cb7bfb7aacf3c6e3723160529c3e7cd0d90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2ED8D 21116 bytes
font_02_sfnt_off0003238e.bin
cf566a5d709bc27f92f4602d4affd31dbbeca83c521e1bbc7d93873cd169d55d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3238E 10268 bytes
font_03_sfnt_off00033a99.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x33A99 16792 bytes
font_04_sfnt_off000352a7.bin
d253c2dfded7d7eff2d3d91672441e6601e25567bb805fe6b97e12dad3417933		 pdf-font-stream PDF embedded font (sfnt) at offset 0x352A7 11620 bytes

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