Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c596ea516fa98d9…

MALICIOUS

PDF

93.4 KB Created: 2021-09-06 09:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: ba28668b6fffc9aebb250f7760bfcaa0 SHA-1: 6f026385eb621ff0045cbe9ac31288ecbdf0c0ea SHA-256: 4c596ea516fa98d9928dd0f614c263cdca57a81ba47f0895ebbf66f095793f58
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document's structure and embedded links align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://grandinspirations.com/clients/75274/File/93818856869.pdf In PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/13951893465.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/36478172475.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609d373d3539e---91653921413.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/livilu.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/99219741034.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2efb1191f6334d2700f899da09b4d7e2/fizijav.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e86a1e214df---47350808901.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/muvofezenubos.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/k4sueqm7i80flea5mv71l0dud6/71814217080.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/vuvesid.pdfIn PDF document text
    • http://museeducuir.org/upload/files/suboleminatofoligib.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/lobewenusekuxewiranidexu.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/46971027905.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c744993398---lobuwusogojemilos.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/walunija.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/kalujilimarib.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/66865376284.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/7imfit3j7ui2341g3djtssn4a0/tomazoxurerusez.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/95776b53b24d9b2ca71438b67af295ec/86594855335.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/2707382526.pdfIn PDF document text
    • http://kalikraft.com/images/file/28530270195.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/salisomoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=3rd+grade+common+core+math+word+problems+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_off00010924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10924 11276 bytes
SHA-256: 26be2f76bf71b4687b1150239187b60d8470ae6645f423a0430e1f0258e4af46
font_01_sfnt_off00012306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12306 17108 bytes
SHA-256: 3da948880b5e5c1d0077ca519ef081767d20af29409aa14ebf157fa7348401e8
font_02_sfnt_off00014f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1