Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4e92b24b6b82bb0…

MALICIOUS

PDF

98.1 KB Created: 2021-08-06 18:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 08d0e83982311b3f68bdfb8b22688a1e SHA-1: 72b5529d345d12587108569d2134c8ee89f5e14a SHA-256: c4e92b24b6b82bb003a47c6a266e356d48fedd4038fd2b8e55c5dbb0c5b69551
204 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as 'Pdf.Phishing.Trojan'. The presence of a 'Clipboard command execution lure' heuristic indicates the document likely instructs the user to copy and paste commands into a shell, a common technique for executing malicious payloads. Several URLs pointing to compromised websites and link farms were extracted, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://aozbt.com/clients/3/33/335f642cf73e2ad82edc7dd4a76dad4e/File/niduropopumupa.pdf In PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4363386a7---bumuxutapimonug.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/21682788979.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/tavoradikufokajo.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607615974d4a8---jenopo.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/2671642331.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/rupowovuvezuzaxebupum.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/toxozuzobanubisezoseg.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/wabib.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/sivetorasuxuzema.pdfIn PDF document text
    • https://aduanaldelvalle.mx/userfiles/file/20370146045.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16107e7e380c33---37317598482.pdfIn PDF document text
    • http://fedoro.ru/upload/file/falololexulitopidig.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/8eov29acgjualivhtp1nktru33/malibitufebubujemad.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/b7da1ae03285fa5ec666476395c5e951/koxegikemixe.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/pugebariwibavider.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9078b3f9d---wunedepem.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/76488241583.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/e70v40um6g5iceb4agpnk06t90/59766937169.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/muzipaba.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/m9rkludlssi3an3n2tupdaj08n/nixipamupuvu.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/69895548560.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/81068019977.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=why+does+my+acer+says+no+bootable+devicePDF 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_off00011a62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A62 10948 bytes
SHA-256: ece9b78e51a6e7b6f74874a24d5775e5df3a167d930f1093c4eb183b02eef482
font_01_sfnt_off00013398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13398 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BAA 17716 bytes
SHA-256: 1667773cf91b711cef7cd9b57cdac19d62ef9413a8641f7a531f7d4781e4c13c

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