Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef3c61c244917c0…

MALICIOUS

PDF

83.0 KB Created: 2021-08-18 18:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: e7944b5056d9425589535a6795f1032b SHA-1: 7a21ea5b0b87d3257af44a9e8a46519c81b76518 SHA-256: 4ef3c61c244917c0f825941e08a70ab30349d883845381df57103bfaef1042cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the PDF structure strongly suggest it's intended to trick users into visiting these sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=avatar+2+full+movie+in+english+hd+720p+free+download PDF link annotation
    • https://perfecthospital.net/FCKeditor/file/zubobodoxalifepurebejugat.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/kikufubu.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/75dccc4921acd5bb941da9427a43cf73/52663996387.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/444a054334180017fb2d2fc446407f42/15808769159.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/dixez.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/xuxarovulewi.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/ac47c521c7b1e10de3834f70ced54420/gamovufutepumu.pdfIn PDF document text
    • http://ps173queens.com/clients/10779/File/19090239337.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/55122695988.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43b52966ac---nexezowuburuxowe.pdfIn PDF document text
    • https://forthepeoplegov.com/userfiles/file/ruzubenu.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084d949d8c3b---dimeretotas.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210601191041.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/58680039788.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2372d0427---2746348639.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/30835840849.pdfIn PDF document text
    • http://lbhodgereunion.com/clients/3/38/38e1f81cb1ac74d12d86c8ba87866b9f/File/tatudasewaw.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/2ff134cc866119775ab00eb97b46beb0/vibojezujesorize.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/3bae84a162f005a3f0729c4386e7fc1f/86581728292.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608978d7e61ae---48815637830.pdfIn PDF document text
    • http://mp-journal.com/media/file/9769102649.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/34781289409.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/340a3447215c21909ca1d611bbbfd7c4/36787915648.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/46057680687.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/fugotazajegexixawi.pdfIn PDF document text
    • 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_off0000deea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEA 16904 bytes
SHA-256: 550a6b60113399429a35692e55d4bacad126a61a48aefd82dcc758cc547d975e
font_01_sfnt_off00010b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B02 11472 bytes
SHA-256: 66d332a5532a2f2886058035f82c003642b662bd466cff47d4c9e8f0c09810a1
font_02_sfnt_off000125ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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