Malicious PDF — malware analysis report

Static analysis result for SHA-256 14dfa4eb07587dfb…

MALICIOUS

PDF

107.5 KB Created: 2021-09-09 08:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 002d9a9b382460dd5d5e68382405a867 SHA-1: ca978328ecc20ea54993e48e454265521f89e651 SHA-256: 14dfa4eb07587dfb865060b53aed53d2f1066fda4ab0997ebb65124e39051407
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which are hosted on compromised CMS upload directories or disposable domains, suggesting a link farm designed to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=blue+dahlia+nora+roberts+pdf+free+download PDF link annotation
    • http://patroha.hu/file/pilox.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/161359292a091d---54580160937.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/jakoxakazegodonizu.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/gugizurogexakipewi.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/53445029951.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/ee57bdf27f66ab7e498c996f7885230d/62653839168.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/xoliriwuv.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/97173794673.pdfIn PDF document text
    • http://zeci.nl/im/image/24228541665.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/41033963120.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1630597899.pdfIn PDF document text
    • http://ipoz.pl/userfiles/file/tilovinefidatewip.pdfIn PDF document text
    • http://104408017.linker.tw/files/gasupa.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613456beedb9f---pafakod.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/gesupanebamasejiterex.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/xowepofekukuzotozamefifat.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/wutipabemoxajud.pdfIn PDF document text
    • http://saveursetsavoirs.fr/image/file/11149512234.pdfIn PDF document text
    • http://donghotam.com/luutru/files/soxupojozi.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/20117562233.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109011147485539.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/3240140616.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613864db7f859---satowixapopukosefo.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_off000139f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15206 19608 bytes
SHA-256: 2599c57a9d7d7cfc960801c9df4bc4b3b0f70f9d1043ae8251b762403467f175
font_02_sfnt_off000184d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184D3 10972 bytes
SHA-256: 8f306f39ca9b7b7f1d60d986fe2090164d0dc79e6b7c497e1e147baf5f72710e

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