Malicious PDF — malware analysis report

Static analysis result for SHA-256 b82a2793520b1023…

MALICIOUS

PDF

73.2 KB Created: 2021-09-03 05:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0568539a58603ccdebbbdb498865751c SHA-1: c48d94d6e71893ed6705e60d6a5f20c116bccb91 SHA-256: b82a2793520b1023d4a99ef40b7123fdf3cddab30997d23645e55a3f1b42c824
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many embedded URLs pointing to potentially compromised websites. This suggests the document is designed to lure users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://travelbilet.ru/sites/default/files/file/baxuxibixixafoxolur.pdf In PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210724_4D4142D785AA7067.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e38f0878ca---vofinereso.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/fajiwejibusulevu.pdfIn PDF document text
    • http://sun-eko.eu/files/file/40780302384.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/fugakozapitojufi.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/070a4a2aa56ce6c19ed9c8dd28290bed/4726099635.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/70645454985.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38129570207.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gosunidojoxaparutevu.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/jisamojilanuvaratatij.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/d336189ea5d39dd024e7eff97cbedfc7/sujunekesukejibufubeko.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/27587177273.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe5e926d9f---98704860722.pdfIn PDF document text
    • http://islandpointfl.com/userimages/zefowariwuwoxe.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/21504898831.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/dd020e8e819e7cf1f97ecf2d5f055ce2/25392817084.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/jusuwajago.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/waneginugomupasexefoxila.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/ronod.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/66befff8b8d28d8e848c638d3a157a39/molujarijepober.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/qp616sb34976g0loe49uapq3ji/konosadizadamasozawuti.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/eb0a13b1fd9c8969f62ad90ae1be6578/9869469406.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/15226694530.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=wildlife+conservation+act+2009+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_off0000bdbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D5 11084 bytes
SHA-256: bdd7a4f5afa38a0295df87dbc6ecba4f1367c8f5c6aaf4efbcd30757b379f56a
font_02_sfnt_off0000efd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD4 15516 bytes
SHA-256: ffe2ae0a0c3134ba4d66aa834e0b8fcfab4e2fdbbe182cbfa1c04c919aaafb1f

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