Malicious PDF — malware analysis report

Static analysis result for SHA-256 926ed90591ee57fc…

MALICIOUS

PDF

88.1 KB Created: 2021-08-04 19:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1405db9b6c602f4209644858f58f1995 SHA-1: 9872d49b0174d8474a2bf34bbce0b3a6aaf69494 SHA-256: 926ed90591ee57fc83871f8f459fed7d287823be5b1371bdbf5ac40949f2d530
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was detected as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or malware distribution lure. It contains numerous links, many pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The file's structure and embedded links align with techniques used to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://bluebiz.kr/userData/board/file/xazeto.pdf In PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/8e5c861c20ac41762a8593ca65266d2c/94351596087.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/jetaraze.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757fa12efbd---48555333558.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/7936032604.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608991207526a---6683007624.pdfIn PDF document text
    • http://technocom.pl/editor/file/fidemoleranizofoboxapeliw.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/83987ea2b2e5ed99b1e1dddf058917ad/ronexag.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/kuwefupuporejetoxozi.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/13401481903.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/da9e9673a0e33d21790980ea4821ab7a/20821669789.pdfIn PDF document text
    • http://omg50yrs.com/clients/6/6d/6dc66c997efb3e4e8ce6e6e7d0694e91/File/sewidaloxe.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/61928797106.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b04295a3c9f---61454867820.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/30913400276.pdfIn PDF document text
    • https://chris-arnold.com/userfiles/file/donarukubekif.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/v7l5n22hictf4tslieej1dm1tf/ropugegu.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f00ba67fee3---62611791627.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/19856758139.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160727ea7ae482---69176381589.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/4ada65457e6d6fa2dc596a6c03648b91/43201536966.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/6b42bc6c5c92cbf7e5543921086b4a43/170788370.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/9470887537c779b9d1ba73a362ff50f2/62654585024.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c994f4b8e99---77819855471.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/dtooocafm4c1do8sg0p6d8nvo5/mokaleleki.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/31497612514.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+design+landscape+in+sketchupPDF 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_off0000f3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010be5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE5 17616 bytes
SHA-256: 498a12a9dfe35f5cfe5ab679161ad212c01276ddc015a1a4b376995ece6f6933
font_02_sfnt_off00013969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13969 10960 bytes
SHA-256: c8cd91c58a7d91682e9982d051f8db9e63e584d912c8c51986474de09a3a0853

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