Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f1e9e7686f288d…

MALICIOUS

PDF

85.0 KB Created: 2021-07-01 21:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8f1371a0519fb687530ee61ca492053c SHA-1: e0469892cc8ca65fddeefe9d3b230444ac02731b SHA-256: 23f1e9e7686f288d334b3624051ca241741383f98aa693d68766773711dd98b3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Phishing: Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious. It contains numerous links to external sites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The critical finding is the 'SE_CLIPBOARD_COMMAND_LURE' heuristic, indicating the document instructs users to copy and paste content into a command-line context, a common technique for executing malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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 https://cructi.ru/uplcv?utm_term=can+you+add+hyperlink+in+pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e7229f6d5---5124600681.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0ca4a6894---83714563519.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3a6d5cc55---veruloresemalaxu.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/kgo6i3ku1esf7mrg2q76idt7h2/62339043250.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8c8ebb5f7---51357371352.pdf
    • https://songhong.info/userfiles/file/12468485078.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/pukadaposezenejasegegi.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098323bca159---84598388502.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607018cc884c8---libupuvodulisiruxukoxejo.pdf
    • http://asiavent.com/UserFiles/file///jiwuver.pdf
    • https://roweryelectra.eu/app/webroot/uploads/file/1620014066119.pdf
    • https://partner-support.net/user_data/userfiles/files/51790471827.pdf
    • https://matrainagycsalados.hu/userfiles/file/57655079320.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e64e902302---fotusabetunisuloj.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/2evudpcta1v1mbdldqdvhaqa9l/34671506951.pdf
    • http://cephedanismani.com/images/pages/file/53361675346.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/5962719f949330bed6ed198f319029c4/45684947259.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160940b7b0088d---parekiw.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a0afe9138---luvumowisosokuwoviz.pdf
    • http://starlightcelebrates.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/wofubevanudiputakutifef.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607387a16c242---22639296649.pdf
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/4865aa6da8a7a646f4d5bea1396e0b30/kobem.pdf
    • https://majubesar.info/contents//files/neweroxavejemawujita.pdf
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/cab58440d561012ab6dcd40e479f0275/4194683732.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160746167f1c51---8451513096.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16098433d94650---81379535487.pdf
    • http://mtsskzy.com/userfiles/file/zugaretamasaroludo.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c520b2d334---81514083383.pdf
    • 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_off0000e965.bin
9b1ba711776808ff087f8438c9b2e2216e2c7de0a2a89aee8ab4027188083b3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE965 17272 bytes
font_01_sfnt_off00011643.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11643 16792 bytes
font_02_sfnt_off00012e5a.bin
89c640897f684fd38b84dca928021cfb8976e0110661e0949f156280cf52d12b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5A 10664 bytes

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