Malicious PDF — malware analysis report

Static analysis result for SHA-256 5291d1776196aa98…

MALICIOUS

PDF

87.4 KB Created: 2021-07-20 12:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: d9b78d1a187c890c7667a4e1daeef0c3 SHA-1: 8fba6f7ec4cf4fe2f5da6d52bff6a7558f9c6ecf SHA-256: 5291d1776196aa985848bbaa508b55372a2a6dcd05aa4be807813fb7263492fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external sites, many of which are hosted on WordPress installations that appear to be compromised. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/4e0341e7c6d00c3bd3c7c8a8db607931/95276893788.pdf In PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/41809931970.pdfIn PDF document text
    • http://sobsai.com/ckfinder/userfiles/files/50625976415.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/64528560803.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/d8v70bkffpmb8nen17ri2jrcls/72704470543.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/851c124307d25c160205d1dd707f3d60/15860155109.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/46664744726.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/faxatizozinefolibe.pdfIn PDF document text
    • http://scottsdalehighbeavers1978.com/clients/80197/File/miriwovuduxusigew.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud//files/37287142299.pdfIn PDF document text
    • http://qhs1978.com/clients/d/dd/dd8db5a278a7ad55a2ada34b8e38ebcc/File/51649716012.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/35f27665f7ddc4ac5d622e3c90fba2d7/zivorakolexasisavukesuzu.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/dofufora.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15ae1a578f---38326786037.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a022a2ac6a2---58842790317.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/e1ea6b9e9760e138d9ff56a88a249ebc/46242021464.pdfIn PDF document text
    • http://chatsworth72.com/clients/5/53/532ec3c8dc0e95779814939736d4df6d/File/27670235068.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/8050310339.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/0mbb65r6ons0sh6emlng6n0781/25943276266.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/dg1k09551ab2kbhe5j2ejtqfo1/81846613427.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609312b64d1ad---pinipiperutupupogiwanoni.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/66890482383.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/8c3a4b76849cb8d87009858fa2b52065/gogamotefuru.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/zezuner.pdfIn PDF document text
    • https://club-sports.net/uploads/products/files/jogebagonojapofaroviful.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=what+are+the+common+factors+of+16+and+40PDF 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_off0000f04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10865 11016 bytes
SHA-256: eae8f4f52289c15a76ceaef6396b70678bd3d31bda606ada135e1c1ccd041bd6
font_02_sfnt_off000121f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F9 17476 bytes
SHA-256: 019b1830439b1f4bd71c1b85d9d46ec30686a74def5ab41604156cfd1213e5c3