Malicious PDF — malware analysis report

Static analysis result for SHA-256 5344e9ba58812775…

MALICIOUS

PDF

81.6 KB Created: 2021-08-16 01:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f199b494a9de62ecaee6e9c18940e23e SHA-1: 47066b32251de4677147cbab605708a9ae7caaa4 SHA-256: 5344e9ba588127754a6df06aaca8d5f5a88b2406d8a9f0a313ebc92a078c70ad
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to download further malware or engage in phishing activities. The document's structure as a link farm on disposable or compromised hosting is a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/e419d0c9b402844409a97525e0f1d352/newolixupojigexuze.pdf In PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b007b463219---fafoxowiputuzadisugozuxud.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa13550a1c8---68699760110.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/99330217735.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/jizuduxubizesazebasotas.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210714_AA5959E5C31DF827.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac49517f2aa---biduta.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/mepuwedadavoxipof.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a251cca6c---88918295461.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/rdjmrj2kblmtbsa0b9au701c1t/20346004356.pdfIn PDF document text
    • https://webmenuplus.com/images/file/pefuwitabajekakoxe.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/bixinisunexegozemo.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/2b7eb078710caf8578188c5c8098939f/61547837048.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16103adc9340b1---47629965349.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/5114100995.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/bisisoxifabewerum.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/11537240643.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5060295be---pexokixepawog.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/21676156421.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/1sumdbf4qjct9ov85hgg82as73/fodiliviruwaloluparetogex.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/jupodijox.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1627417153.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/827fc532a6a31ef2d991ea38c779a67f/50372749207.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/wolajigedomudofefi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=max+lucado+livros+em+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_off0000d788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD788 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9A 18380 bytes
SHA-256: 0f12a47b01054646a82f9c91c5555879ec2e1e696a245e30c4a54a6c210cd816
font_02_sfnt_off00011d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D66 10840 bytes
SHA-256: bb252fd0904d60e5bc59bb6b881eeca03d1c8fb53b17141e8600afce76a6f81f

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