Malicious PDF — malware analysis report

Static analysis result for SHA-256 539ca9cdcf7d5f03…

MALICIOUS

PDF

85.2 KB Created: 2021-09-07 04:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 501c815e8039f05393ae135df0e27ecc SHA-1: fad18fb0d540772acd461b479058cb8e82026d67 SHA-256: 539ca9cdcf7d5f03e3dc4bcb827b6171afbaa773c4dc375732dab40c6680fc50
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL findings are sufficient to infer a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://studioego.cz/userfiles/file/11555732443.pdf In PDF document text
    • http://cichanski.com/Upload/file/pinipofiwuta.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610608384eec5---52095361088.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/monuraladawetur.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aab9f77bec8---tepugopigirolix.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8fdf92ef1---nutune.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/rutotumozalubuxuxebumov.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a540c4eef82---fagarij.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/c6ed42bbc5537e08e3820cca25ff6c68/siloneburiw.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/86413569550.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/bazulaz.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/7380125948.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/mujuxerolop.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/soxaboridabidukuv.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/fivitur.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc1915bc7f4---ginanirab.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/68823400433.pdfIn PDF document text
    • http://centrumbiznesurawicz.pl/userfiles/file/vasigerete.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/gonesiduzuzogagoruge.pdfIn PDF document text
    • http://theettiares.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/bomutojirusabi.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/71761333340.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/59766635302.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/j71bv8221nmanoc0e0ibb74usf/vusarugosadebi.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/23651954782.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0bc941d5d7---tufexizipavonanefirewara.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/9bh1938qo7g3vtt3apkf7hjq4k/bijelifutu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=up+board+scheme+2020+10th+class+download+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_off0000db83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB83 11320 bytes
SHA-256: 14fae4232cc0aa784b6b08a8c7ed9e61b2b08b88e0f16a7ecbce0f40226eca2e
font_01_sfnt_off0000f5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E3 21952 bytes
SHA-256: bafea9a05ab3aba59badd2950162ea8a1cb936ac7f5a67e2f6f900de3ca8744d
font_02_sfnt_off00012e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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