Malicious PDF — malware analysis report

Static analysis result for SHA-256 c761f0c886d4c6b4…

MALICIOUS

PDF

85.7 KB Created: 2021-09-16 11:14:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4faf7843a0a5db93b5088409785ff9dc SHA-1: 6cb75ec34cd614f0389ae98455c7feb0bf6c758b SHA-256: c761f0c886d4c6b44e4ab1998e68c33826fceef48b3c093bf2fd522d7e7f1ea9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, pointing to numerous URLs hosted on potentially compromised WordPress sites. These links are likely intended to redirect users to phishing pages or other malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142640b76e3a---fuxonuzajew.pdf In PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/o3i0ot84v6fgbso5qrhupet0s7/bulanurutuvisanev.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ebfeebdee---54355688411.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/49716270285.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/80519291613.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/28888271627.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/42072042482.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/73919895944.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/rujexuzomokekagaba.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333212c8fd9---56683717806.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/99962647104.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/22840768353.pdfIn PDF document text
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210903_132355.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/59793281238.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/15148022855.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/10360612435.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/rufusipiwitalofaxox.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/13987806737.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/miwope.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/46301311518.pdfIn PDF document text
    • http://ridendo.cz/files/file/25542160954.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/7446955363.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/82185276130.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134da48a5af8---wazewogexe.pdfIn PDF document text
    • http://itcbeautytrainingschool.com/userfiles/file/tewiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=what+is+android+systemPDF 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_off0000e90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001011d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011D 18296 bytes
SHA-256: 829ae6fdcea61deb13c64a000e967d1cd66f94901f7504cad641094cb6a9acb4
font_02_sfnt_off0001313d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1313D 10572 bytes
SHA-256: 6fc1465f8f804f736725e5129f1f0d2358f8a5f94370395ade196eecaa418468