Malicious PDF — malware analysis report

Static analysis result for SHA-256 95d2de4536b93039…

MALICIOUS

PDF

69.5 KB Created: 2021-09-28 07:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 753d352ef68df87453fb11a7c083121f SHA-1: 59cb106b52bca1804e99825e70e71aa19844af2b SHA-256: 95d2de4536b93039db7127e543a0248834755fb05919a7264fb8f4647a2d8cdb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDF documents. Several heuristics indicate that the PDF acts as a link farm, pointing to compromised WordPress upload storage and other disposable hosting sites, likely to distribute further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bede71195---zuruzetamerageb.pdf In PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/vinefawemafuxefogeba.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/66356113236.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/takozumalobite.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/15683278502.pdfIn PDF document text
    • http://hbaoge.com/upload/files/xufoniloxazojiwa.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/90165045275.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/vafunej.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109271414166450.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161333e264367b---4462552361.pdfIn PDF document text
    • http://orenprom.com/img/account/file/kulobefuveni.pdfIn PDF document text
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/rigufejakivepopu.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/nijugilimevotiraj.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/zomidi.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/91749042339.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/gujukipevubarare.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/58084009502.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/donavomenewolozuj.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3625e66a6---53780691251.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021092010415320.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/14577131445.pdfIn PDF document text
    • http://gr-chem.com/upload/files/vuwuxeralobovanodufabojez.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/7822686556.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/wigonutiw.pdfIn PDF document text
    • https://gulamanis.com/contents/files/tojipasiwitoguze.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/98976617585.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=the+three+waves+of+volunteers+and+the+new+earth+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_off0000b266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB266 14568 bytes
SHA-256: 77c209c2e81242c556ebe0b30933a02aba6ccac67a6d86ee236fff0b0fde5181
font_01_sfnt_off0000d743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD743 10720 bytes
SHA-256: 7398cb06f9ef2c65333f8dbfaa343e086fc3c749e98b8c4f974e76b6281005f6
font_02_sfnt_off0000eff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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