Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bec0166bc6ae41b…

MALICIOUS

PDF

92.5 KB Created: 2021-07-21 08:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 190d4a5e652d728cea7f8e7029cc1670 SHA-1: 10e56cc6bf7d35afb3248087dcd68978c0a79073 SHA-256: 6bec0166bc6ae41b97da98e72b61e4de7102ed0626fc5bd00afd7c75d815f4da
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains an embedded JavaScript stream and multiple external URIs, indicating it is designed to redirect users. The heuristics suggest it functions as a link farm, pointing to various compromised CMS upload locations and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://autodilykanka.cz/cmsimple/images/file/25340155572.pdf In PDF document text
    • http://epoch-making.jp/js/upload/files/rinaluxovanalagezuza.pdfIn PDF document text
    • http://solee56.com/ckfinder/userfiles/files/26103360025.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/daf7510df638f137b1e6777b250a0c5a/dubuzu.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609c48e41f40c---dalulawi.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/9a2699d5992c96108c455994dfff99d3/pefizuveropazobesikef.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/dugawakezigal.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/25900613782.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/wixisegowez.pdfIn PDF document text
    • http://omg.su/upload/File/64460699823.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/064fa16a3be77603931f472c364d9c07/34435781225.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/bisoriwudujofax.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/cdb7686aa776dcbe5656f7cce36df110/15304038485.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/10367523145.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc230d118a4---wovusir.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/gofinafi.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/28195834561.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/zereka.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608c683caf238---kekekiri.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecbc0e9566---nokadopejapiwaporugefeme.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/wobigidujuvedotikul.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dafa7a3de9---rigotegonoxidonofuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=lincoln+hawk+everytime+you+walk+awayPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FC 18544 bytes
SHA-256: 15b09119981017dc5c1b41cfae648fec5fd1e345870d4dd1ac7dda48324a6fa5
font_01_sfnt_off0001272e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F45 10740 bytes
SHA-256: 9b174c6d7a84453dae30084ee69180a2fc05870fc25d9ce635bc84b73bb4f695
font_03_sfnt_off000157cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157CD 2440 bytes
SHA-256: 5f9489db96fdfefda6296b7f3d1625c07d7946c1d71a655e11177c1cfffd0e72

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