Malicious PDF — malware analysis report

Static analysis result for SHA-256 66343682299da0c9…

MALICIOUS

PDF

82.6 KB Created: 2021-07-23 06:41:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e0e9a8b1c8e836df4d82ef2a1d717216 SHA-1: 5ab104212590f6d70187ee8d768bc98edbd916b3 SHA-256: 66343682299da0c9816151733349fe083e574a24e07102748f53a225a127752f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing attack, potentially using embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16098f202f39db---lijof.pdf In PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/ded6907ecffdb9a81846e9b5429738f6/nejerupa.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b9b420c84---vitikewukerep.pdfIn PDF document text
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/wogamaravurip.pdfIn PDF document text
    • https://lecachet.fr/docs/files/fevivuz.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/2781a0e1ff7de2f27be77a3fb844c215/93923625046.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba58f48b2f6---musezuwukivikabaporekozux.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075befe3d223---79422680011.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/n6sm7nf5mma0alhjrfomf22ei0/bofip.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/rejugigifapuvazoguge.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/45098940364.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/35081042925.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/38sgjqrmili0hr1aoqhnhhl3v4/31896180913.pdfIn PDF document text
    • http://shosholoza.de/file/dibomefeduvuwa.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/kesoxujor.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/8loj5duhtc956ldmubrcn2tqgr/31284759284.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/67917476192.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bf591e5c0df---55770031669.pdfIn PDF document text
    • http://quadocdao.vn/uploads/files/43764332883.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/vofexaxaxulirezuxusi.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/zewizimokifiwepoguwad.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/73007459852.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/sulijefuxedurobumezanuzo.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609602f05a498---10079466071.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/2e146159ea301de747121b295ead1151/xewejegotexovegaja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=bruno+mars+count+on+me+song+downloadPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDD 10860 bytes
SHA-256: 0b09eacbcc42254f9b61271bf629a411eab70f645b5bdafe394126697e82f55f
font_01_sfnt_off0000e6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DA 3224 bytes
SHA-256: 52c98ed3d739471ea573cfcd73606b5acc3fb4900cccf0a314308b097892b190
font_02_sfnt_off0000f373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF373 17368 bytes
SHA-256: a0c92891797e6338606fa0064b22e8154386977512c2938fab27c61049dfb7b2
font_03_sfnt_off000120c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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