Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d39e77f09b51921…

MALICIOUS

PDF

107.8 KB Created: 2021-07-24 23:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: f8ea1adbc84ee27fc352c1ed117e01a4 SHA-1: 7ea97f04a021f9f41381eacd03ce7934a8483173 SHA-256: 8d39e77f09b519217f85fd966e4e5578e2506b09de386e85396ed98e479271b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body was unreadable, but the presence of numerous links and the heuristic findings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 https://genegurumiraclehealer.com/userfiles/file/15789512163.pdf In PDF document text
    • https://protradingindia.net/userfiles/file/buxofamuvuw.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160975fff8a0e3---89512606562.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/wezemepokesopojoliwer.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/80094328306.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/4339614553.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/61214169832.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/ronorodo.pdfIn PDF document text
    • http://net-marketing.hu/images/files/71713171288.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/2ac04c9847993b0e9471bac11aa1b9f7/venikopatanabutinefu.pdfIn PDF document text
    • http://freeski.hu/freeski/file/25491519523.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b09176a4f77---rabepifozamuz.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b30c1035662---kalisipe.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/409fb578b9dd321192e97537428da9e5/82169410932.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/xulotugejemebunuzidu.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/2k8kkpb7ho5e230lf67vkri3kh/31168181948.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae751035ee---21912842559.pdfIn PDF document text
    • https://bloomeng.com/uploads/4162723627.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/xunemuvoxusufunekasok.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/vuzuvifoper.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ab83c2da8---73259745672.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/pigawimajevosalemu.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/doworugokifafozejusa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=graphic+anatomy+atelier+bow+wow+pdf+freePDF 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_off00013259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13259 24532 bytes
SHA-256: 394c05c6ad9daed4699d8dd345b6130649f3c3e0dff0b27cfbf193a9f438881b
font_01_sfnt_off00016ec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EC5 11096 bytes
SHA-256: 71b1fef22e5d85135a8a3678654e1859e09081a794bc08c87b466cde0f8196d6
font_02_sfnt_off0001884c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1884C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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