Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f531321fee3f7b3…

MALICIOUS

PDF

87.1 KB Created: 2021-07-02 15:18:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c15ca48ac79d0be5589ed6e34b31f3a0 SHA-1: ef6f167924f97c1057175f8371251f2c4443a854 SHA-256: 8f531321fee3f7b35faf13841db0ad43b0f3415be7bac0d6b856da3d957acefd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malicious link farm. It contains numerous URLs pointing to compromised WordPress uploads and disposable hosting, likely intended to redirect users to malicious content. No scripts were extracted, but the structure and embedded URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa655f12073---71910937250.pdf In PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/13931162852.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/41191848622.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/49044646265.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/35262254581.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/53594081569.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606e5549a06bb---27921485232.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/89385427113.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e4331c6fe---51972111512.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef91ab2d34---pegigidaxo.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/609d6d9e9769e9d6d80d3e53789c9f25/soresalelozakofa.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c92c9d749---suzitonamosunatepib.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/70bfcaea8a827feaae2f6b87f3017140/37673519694.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c73bd8d1a2---dagadetu.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a70aa87f3fc---jeborulilewugu.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/23910015266.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160761107a2f74---fosolodasidopumuma.pdfIn PDF document text
    • http://nktrading.qa/file/files/nukopuwaminuv.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c340c3056---xuzalovojefefo.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/dtc02dvclksrmm2oj4ba9bk2a1/11611136333.pdfIn PDF document text
    • http://wirheiraten.de/images/file/17412066787.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecd0d9654e---bigubebepefagax.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/62129978100.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=chicago+race+riots+1966PDF 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_off0000f0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E8 16904 bytes
SHA-256: 58ec6275fd01980b451d77555b08f48573f7e77784f64ae5df7fc5ffff191313
font_01_sfnt_off00011cf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13508 10780 bytes
SHA-256: 41a756a85eece5d10fe9c6deed0e99a6429d3797f65ea6f8545b82100e1edf44

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