Malicious PDF — malware analysis report

Static analysis result for SHA-256 ede2824504d9ebbc…

MALICIOUS

PDF

81.9 KB Created: 2021-09-06 21:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5d74dd9c4e30af71c85ed269a4f31c8a SHA-1: 10d0588e8696c71450234db89a354d88da2ddc08 SHA-256: ede2824504d9ebbc2946726c5fefb501074e87501a64ed1d2bf2167732a3fa2f
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URI heuristics and link farm indicators supports the conclusion that this document is intended to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://autoscuolauniversale.it/userfiles/files/dafaw.pdf In PDF document text
    • https://gizaviation.com/uploads/files/85346283980.pdfIn PDF document text
    • http://sinoorchids.com/image/file/remiji.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/vexudiwefakafoxovipidezut.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/52486522455.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/68309449549.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b73058ef5c9---toweketefebi.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/98638601197.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/51575304412.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/bujaw.pdfIn PDF document text
    • https://360mart.net/uploads/files/negasezuj.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/5ee1106c64f39a7163c85fba794875fc/75392247817.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611f0dd0435eb---sutodigilafowuxukagafu.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf6e70ea12---37803651320.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/rufuwidoniwad.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/81003540497.pdfIn PDF document text
    • http://megalaserasia.com/upload///32207598344.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/55451262229.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073307c1cf28---judenamiremijudob.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1610787d2db930---80872104914.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c08732e3a---dopoma.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210902200721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=jstl+tutorial+for+beginners+with+examples+pdfPDF 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_off0000d694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD694 18936 bytes
SHA-256: 07f416d86c133508c1308a51195f183bec1d23e81312a0f602ad1f6b702db761
font_01_sfnt_off000107bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BB 11364 bytes
SHA-256: 203b0c02d93fa5386aa8d1cf12411d732f79f66cfd708893762daafcf616a366
font_02_sfnt_off000121fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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