Malicious PDF — malware analysis report

Static analysis result for SHA-256 65f539439d9cb3ed…

MALICIOUS

PDF

69.1 KB Created: 2021-09-27 04:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d9ffbeb4b51d4ff1c69c66bc747e5c27 SHA-1: 7270f64592a7374f3ef64d0be87df96ba55946cc SHA-256: 65f539439d9cb3edfd10f9d4ea9568ee34f1f910615bbd83bdd934923ed06ee0
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to potentially compromised websites and disposable hosting, indicating an attempt to redirect users to malicious content. The presence of link farms and the use of compromised CMS upload storage further support its role in distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://auto826.vnpec.xyz/uploads/files/jikavuvogukaf.pdf In PDF document text
    • http://zentrumok.com/userfile/files/muxizene.pdfIn PDF document text
    • http://nwatchonline.info/userfiles/file/81191409654.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/96760070756.pdfIn PDF document text
    • http://computerdoki.hu/user/file/32552654214.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138db5572fee---99266846685.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/19029366942.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/5794997689.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/52306575023.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/xamenenekikitikogugumet.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/dibekorelufopiwodepowuw.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/mirupokusarire.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/2c7190fc91a15e736f6dd62f0d6cb73e/powanobesejujufigisom.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/69891059224.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161319afe1ff17---50789339376.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/84801023346.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/3thqoh5da884de7cft34sgatqv/zowipunidafelopuvubux.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/90285583015.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/87583249956.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/17e8f46a6e07e7e564adb5b57715942b/18374291989.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/96449371978.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/jixegaxibatexigit.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/8168819577.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/7988479814.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210921013617.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=digital+newspapers+onlinePDF 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_off0000b138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB138 10512 bytes
SHA-256: 4422c8ad13e37808217cb3304dfb7c6471e410dd4d104c1db2a1001926181cf1
font_01_sfnt_off0000c955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC955 14868 bytes
SHA-256: 8a6b3c36bc174bae9df7de8cb0815f0368448dde804674fc3fbe7673a7a1b6c0
font_02_sfnt_off0000eea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1