Malicious PDF — malware analysis report

Static analysis result for SHA-256 a50de61e18a719f2…

MALICIOUS

PDF

72.3 KB Created: 2021-08-28 09:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 09d8568df823daf81307e503be4e5e41 SHA-1: 5ab813d64216d57d55bd2d63d3810a1abb7df31b SHA-256: a50de61e18a719f20b4937cb024af13d327d4e05fa8c88a3ec6fdb3dca16ad94
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lead users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/881f3fb383633e77d9525eada74cf866/midusosuriwubunasopi.pdf In PDF document text
    • http://premiercontractinginc.com/files/file/42591990539.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/16369225724.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761d1c28f8a---20684736512.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/nawema.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/63687353830.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/52913859755.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/8cf5b14faf2c4804d2278a26300db994/pelobanoze.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7c518aafd---lamaxagixamumavupajoxanu.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/2354176900.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/61411576110.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/9bjjclp116v7m0drdlicl0q3g2/liwemawomugetuzugesatun.pdfIn PDF document text
    • https://virker-ikke.dk/files/69543110989.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/11284935771.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/67037758365.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/577c03cca170b2a472c245dac0d6c056/64160766119.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5a7fda8d1---9361973200.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/butixukeluzafolanimoledo.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/7b13f5a4a94d1f36c48ee3fadca63514/xafironesak.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/0f43339cd00c293945b2f3939c120943/gemamumibuvega.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/lotozusokolamamugogobaze.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/vuvilakukobexusolimebe.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/97713165882.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=nc+permanent+license+platePDF 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_off0000bb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB7A 10392 bytes
SHA-256: 1b79ab593fee055d4c0ea7426c6dac7bc569b83811332c416413a512b748688d
font_01_sfnt_off0000d2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F0 15944 bytes
SHA-256: 70a79ecbdc3fdfe892cdd69441a23cbc83435e8c3960e3e873af51a5eceb68ba
font_02_sfnt_off0000fbef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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