Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce63532a8bf8035a…

MALICIOUS

PDF

83.2 KB Created: 2021-09-14 04:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fb553eb0015d829dcfc941c890623916 SHA-1: a5626c3f67d504224ee2c63bf677c2a9ac10de4b SHA-256: ce63532a8bf8035ae90ce9cacf06d4732d8531402eb611ecfd05b02e026bc867
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document likely instructs the user to copy and paste content into a command-line interface, a common technique for executing malicious commands. The presence of numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggests a phishing or credential harvesting attempt, potentially leading to the download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://livredart.com/ckfinder/userfiles/files/15560073123.pdf In PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb41eb544b---neladuseraxokin.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/budagukelidenasejul.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/51590182949.pdfIn PDF document text
    • http://inica.org/files/file///tejovone.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/5324389760.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/koderopezat.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/41800307283.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/18818752855.pdfIn PDF document text
    • http://whdhgs.com/uploads/file/20210904100724881.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/kidapadoxi.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/25731931459.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/zejiwowedivugurepagafolas.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/moxolonutesot.pdfIn PDF document text
    • https://85097781.com/upload/files/wowutofukedop.pdfIn PDF document text
    • http://art-ball.net/files/file/87334195948.pdfIn PDF document text
    • https://stotex.rs/files/mesumu.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/sakujikirevu.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613810b3cc782---71249464805.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/6ta315cslnnn9ka88ppmr0mltf/nabijid.pdfIn PDF document text
    • http://gestioniarmatoriali.it/58004160437.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/9cd434c7b4be46bd6edf9fb7e5df4f72/rixilatamoberafutanenoxo.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/93189384232.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/27367343197.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/22317369526.pdfIn PDF document text
    • http://www.centrosanmarco.eu/img/news/files/77373492297.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=change+mac+address+android+rootPDF 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_off0000de01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF618 10804 bytes
SHA-256: 9b1ca7180b15524035e048fa190a5b681c407efed7fd87e2abf446e0dea6dccf
font_02_sfnt_off00010e98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E98 18884 bytes
SHA-256: aabeeb4c975ce81260d8dafe3be635d3613a39b07dfabaf0b7239eb5b2bf62f8

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