Malicious PDF — malware analysis report

Static analysis result for SHA-256 51de8c3e3f644f73…

MALICIOUS

PDF

74.4 KB Created: 2021-09-05 03:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cce828a997c9d3cd5eed429849a8a3d2 SHA-1: e8a6f05f0f19c556bcc8eac6f9f736d75f17065f SHA-256: 51de8c3e3f644f73ad6b0477874bd1bdddd4ea675ee83df519889999cdaa6a5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute phishing content or further malware. The presence of embedded URLs and the nature of the heuristics indicate a deliberate attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://irlanc.ru/uplcv?utm_term=active+and+passive+voice+present+tense+worksheets PDF link annotation
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/gujebapejapogez.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16083cd0b634cd---mosofe.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e810c7e653---40168372267.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/73342107907.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/81062632526.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/98633580044.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0575d57367---10714299266.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210807_102752.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/39538957213.pdfIn PDF document text
    • https://protum.se/file/5336974790.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/joxoki.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbf31f3cef4---34456569727.pdfIn PDF document text
    • http://headrepublic.pl/images/files/35769554615.pdfIn PDF document text
    • https://jaiminsales.com/ckfinder/userfiles/files/31453298900.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/70f3ac4879318f46462aba2a0c93a3e7/xitipixapal.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/77280745603.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/meduzosodegugoxipara.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/dawuvaxuxogolijakeno.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/kugabonab.pdfIn PDF document text
    • http://pronobile.de/catalog/file/roserugel.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/26h7ttjpvfhdf6s496jvf2khak/48820577416.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/2310877607034ae4f9d5293b7f2f0228/89432110509.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/81a990521a7434f7b86642df64f649a1/53453286883.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/45628354289.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_off0000c07d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC07D 16320 bytes
SHA-256: a6a8499b8ea8b1dccf4d53f241584f5dbbda958facf44a215f141388f4e95caf
font_01_sfnt_off0000ea62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA62 10792 bytes
SHA-256: c8e0b6daad3bdf3b6cbde7f1906a64822f394664499363ac3c63d6521746bb16
font_02_sfnt_off00010355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10355 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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