Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc677d68ccba6e2b…

MALICIOUS

PDF

104.1 KB Created: 2021-07-30 12:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 7af90b779033662cd86e577dfb5ecaa7 SHA-1: a1bde2623962e40d2d112ce3f2a8dcb7c61bd432 SHA-256: bc677d68ccba6e2b396893429ae076d80442e83a14cc2c6f4f8ae823f62a635d
196 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs the user to interact with the clipboard in a way that suggests command execution. Numerous URLs are embedded, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution attempt. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://nomylo.ru/uplcv?utm_term=cambridge+igcse+biology+practical+workbook+answers PDF link annotation
    • https://kenhquangcao.vn/uploads/files/fifegur.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/b8f9f75beb40b830621a19dc335f0600/wobopuvorewososovuvavu.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/kepazesagilojawiwudijuba.pdfIn PDF document text
    • http://project-st.ru/userfiles/file/zetomulerunodexurusan.pdfIn PDF document text
    • http://eventcompany.org/clients/e/e3/e30ef11cf4efe639fe6592aa37b9cb94/File/momotupobajonade.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/39o4atskblt56q175jb6jt476h/wililiwobixum.pdfIn PDF document text
    • http://dentistturkey.com/image/files/lajiwagamolir.pdfIn PDF document text
    • http://armanetti.com/images/dubiroj.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160764409a76d0---vogopaxegonebuvezoruro.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/zoderajebetal.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/dd7f66e1b70bb1b5c42728458b577e31/81666854610.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b59c10d4c94---vemexa.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/66773373373.pdfIn PDF document text
    • https://watertorens.nluserfiles/file/60826073889.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/10224035533.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/20639392276.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/sifojujalol.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f55a0cb457---tukakapaxapazuvi.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/bekuwojepozajusuzirafif.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/petefugizegopusikopinigox.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/0869e1cd94233c8cd1facde891a688e2/parudit.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/jeretufapevosazonurur.pdfIn PDF document text
    • https://areicon.com/images/file/wipanile.pdfIn PDF document text
    • http://climtech.com/files/files/32135826769.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/dee0ad5191bc68f5a4128eec90b54cc5/68311221995.pdfIn PDF document text
    • 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_off00012b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B22 11320 bytes
SHA-256: b9b47ca3ca7be3a7e7deea6456da68632b6490551a294e78ace536987860023b
font_01_sfnt_off0001455f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1455F 19380 bytes
SHA-256: 6437b3f77dd555373f434221db82ade536f05ed796006c31f7e4bff923ba5c70
font_02_sfnt_off000178dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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