Malicious PDF — malware analysis report

Static analysis result for SHA-256 38030e7651f3a622…

MALICIOUS

PDF

72.8 KB Created: 2021-09-07 08:28:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 940736f880e5499c6706d98aa55572ca SHA-1: f24db72389d6cb4c657a0d669eb213fef1f11313 SHA-256: 38030e7651f3a62215fbe66c153fb0b745ab5120667997b1fa78d69aa7451da7
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lead users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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://tomgiongvip.com/uploads/files/file/lojulumuwijudotizizoza.pdf In PDF document text
    • http://nesemlak.com/test/images/uploads/files/21208193459.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16201689858934.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/59156978122.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce3a54eb71---4846588653.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/50e90be57fc8a6bfbf40c2717be593c4/57258774199.pdfIn PDF document text
    • https://buyafranchise.org/files/files/vonilemugawiwog.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160accb59d3c27---fejetoveda.pdfIn PDF document text
    • http://paynechapelduquesne.org/clients/9/9b/9b910c66cef3ae2d1bb1fd5804160a19/File/rirowev.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/44749882785.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/a9e69c8874a475b60dbf20d7cbea4ad0/bodunisapolisidezal.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/35827664642.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/mafad.pdfIn PDF document text
    • http://kinocosmik.ru/sadm_files/vebodexozelagatububata.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/vekumogerusunanediwugovo.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/ckr4glsu69bf0js01n0dvikjlh/67687181155.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/nikodaxojutaxewosirip.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106f98b459f4---tunawo.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/d584ad5dde1bf738a7d5402a2c7aa200/88789404090.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/losamimobepizobebigeb.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/fofuwopudeb.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/javop.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5b37867095---gukipoz.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072300da99e9---96808556321.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=ejercicios+de+matematicas+4+grado+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_off0000bac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D4 15928 bytes
SHA-256: 8d8db18a5839185298f0434b648f1055fd629270b72911e7ce6e69c4a385d466
font_02_sfnt_off0000fa9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9D 11004 bytes
SHA-256: a34bf8fc64fd670e8f72e4c5d5d7bcab369710f676c3bf40bde7fbb097d9f198