Malicious PDF — malware analysis report

Static analysis result for SHA-256 d630b73728ac0650…

MALICIOUS

PDF

81.6 KB Created: 2021-09-13 13:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d755d1ea2b18bfe6f5fe889d1ded3bda SHA-1: 192912db7380c548f05cd3a1436a791c8002f770 SHA-256: d630b73728ac0650126ee04637ef22dff222a972ad09c693f7e2aef1390475f4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious content. The 'SE_BROWSER_INSTALL_LURE' heuristic suggests the document attempts social engineering by prompting the user to install a browser extension or update. While no scripts were explicitly extracted, the presence of numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggests a downloader or phishing lure. The document's structure and embedded artifacts are consistent with a malicious PDF designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://jamalcar.com/userfiles/file/32097048624.pdf In PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16136fa7d8610e---pigulapigosezobuf.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/jonudovamikimusixufaxene.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/3effc098f266aaf9ffb3f6a5573f642f/kepigorazuvebu.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/losib.pdfIn PDF document text
    • http://htwy.com/upload/file/mabox.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbe7ec4144---luluvomutupe.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/45138817036.pdfIn PDF document text
    • http://ladna.pl/user_images/file/zujojetuxabizufazelenato.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210911190419.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/midowezewam.pdfIn PDF document text
    • http://whatdwellswithin.com/file/85995422395.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/moferofoxutudubam.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/htm97dg7sbfjs3d4jnjte9tkgg/53480805189.pdfIn PDF document text
    • http://ttc-investco.com/img/files/votafakenululawu.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/nuzevatuzararimiviriloxo.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/41640064714.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/zobejufopolixilajobusor.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/witisufevokapenakom.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/kebepafema.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc0f026528---kutunopolowinipewet.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/jafoketotixivonanoku.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/20054353908.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=windows+rt+edge+browserPDF 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_off0000da25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA25 18172 bytes
SHA-256: 5f0bf52dae4ed1acc42f9fed2d5435aad89c4a78a689f908585c2f9581fb33f9
font_01_sfnt_off0001094f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12166 10436 bytes
SHA-256: 87dd761bfc27dfa6850c2a5530c0bcb73ca299c36bd7711bd24d21700f78b9dc

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