Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd9e204882e67318…

MALICIOUS

PDF

82.1 KB Created: 2021-09-07 20:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5958d79d1125a772e8bf8e23aa1c939e SHA-1: d937be9300f114a3676f3006d5235403fbbace72 SHA-256: bd9e204882e673181c9cdd4eeac41ca51ab983400d978b74f80df5b156054e43
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It functions as a link farm, directing users to various domains, some of which are hosted on compromised or disposable infrastructure, under the guise of providing 'java tutorials pdf free download'. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pistant.ru/uplcv?utm_term=java+tutorials+pdf+free+download PDF link annotation
    • http://sillajen.com/fckeditor/_upload/file/36438657550.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/31191068317.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/padudipalaf.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082bc53c3450---kimivoxugafolilukoloje.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/buvura.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/83mv6paua859ll6gh2fjlul671/92361941527.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/fd9d5c94e80ebc06181b4a5c2d12cf7a/wifesojekefabena.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3d14e8f91---kagopazejonixadarasudiku.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/kejifelemixududodeke.pdfIn PDF document text
    • http://componentcnc.hu/uploads/ckfinder/userfiles/files/81617862774.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/541cb95cda01b96a6b4b252cd3dce457/77279988854.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/4942577194.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d762482f283---vevajanajobipozomas.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/4knlpk3oqf6pvhjr8np0vkrjbf/76863117440.pdfIn PDF document text
    • http://mfahk.com/upload/files/31822931321.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/ba5c5db1eb162794d86275c01d3cf192/51717795748.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/28055785545.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/22519184539.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/0bbaccf86dbf03ed58779c64f435f586/38044322032.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3031cd312---56172857693.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160761f3b091be---5329720339.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/ketodufiredilukejama.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613092e00d437---xawunigozalaxemo.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/genabaxena.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_off0000dcbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBE 10736 bytes
SHA-256: 4b0d5d2f29deab196acafeb407eaec7ac24482f0798a8c217815debe10b52939
font_01_sfnt_off0000f599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF599 17676 bytes
SHA-256: 062394256ca92a8280a364289fb6acec6fa4c2d89e139a03bf952098f7b14725
font_02_sfnt_off000122f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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