Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b10978666af758e…

MALICIOUS

PDF

138.7 KB Created: 2021-07-27 17:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7a9beed65bf71e90446ab988641fdf5b SHA-1: e9045dfea3b0f4d95c76978170dedd6992619b47 SHA-256: 7b10978666af758e95cc54d458ae1dd42c72f7ba9fbbc2f5946616c9e9a80d9c
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document likely instructs the user to copy and paste commands into a shell, a common technique for executing downloaded payloads. The numerous embedded URLs, many pointing to compromised CMS uploads, suggest an attempt to host or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/dd64ba059fb4c794688d86e2133b0ab8/nedibugu.pdf In PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b50bb2582---ganes.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/o2mkmaaeee8urg0b9nvpgbrkq1/tigitukovuvazitibot.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/35508736047.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfaac37c04c---74557097166.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608abf5863660---21646212889.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d19d3068b---jebojazev.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/ee1b963093dbed67bd26bc6323839a04/xejuginavoliwute.pdfIn PDF document text
    • http://bjallstar.com/upload/file/16027143435.pdfIn PDF document text
    • https://wagaskar.com/media/kutudosapudaxemimesu.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/40512058435.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/wupokivonoz.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021070805573484.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb79da1378---sosuvivizagobuna.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/dekulalidujat.pdfIn PDF document text
    • http://lhs1965.com/clients/880801/File/7156480659.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/bexugolizevuzaxe.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/73606731348.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/61692540440.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/i3v03cfoh3tilsqg8nmhr6nl8e/viwimotulajaxobu.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/kijodekujurunujegeju.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb60def1c9---ronaw.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/378a4d7c59058aaed4e7321b5a84a914/pupebogizamugedaso.pdfIn PDF document text
    • http://webbuilders.com/files/file/wuvalet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=michael+crichton+sphere+pdf+downloadPDF 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_off0001bb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001d37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D37D 10796 bytes
SHA-256: 9989b66ec1eee1e261e9243535b8cb3a053e399a2825f12509c018285af666e6
font_02_sfnt_off0001ec60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EC60 18000 bytes
SHA-256: d154e11144654100fd59b722de619d30f48eb32cce459fe6ac6110bbcc46d401

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