Malicious PDF — malware analysis report

Static analysis result for SHA-256 693b5fe328eaef50…

MALICIOUS

PDF

98.6 KB Created: 2021-09-05 20:16:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6e4d99bb01d02b7449f66c88d96a9ea5 SHA-1: 0a1571277c9bcb24347c3ff4fe9a4dc19d1bb65d SHA-256: 693b5fe328eaef509898c642501f400bc6aa087c32edd364d66bcddd72bf5f4d
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS uploads, suggesting it functions as a link farm designed to redirect users to potentially harmful sites. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://philabc.ru/uplcv?utm_term=lenovo+x230+tablet+hardware+maintenance+manual PDF link annotation
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842f5c3eefb---figokalaxelope.pdfIn PDF document text
    • https://jagominum.com/contents//files/25821981743.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/jgjqvqrjpfphfce3e3coaisgfs/6408375695.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/49114215336.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/forezono.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/t6uqrs1fe0kl6qrq4tcp5qol8h/tepezusosipigemoxuzumola.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf806e8c795---50644680039.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca3fb2873bc---gaxil.pdfIn PDF document text
    • http://yepuco.com/uploads/files/83551242603.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/7664e97ce239447b634fee51801b998b/57158669185.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/85fe9ef19a8d28f3be15dd7858ca8bac/14811551125.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/madodexomakudakubusexik.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/27529332216.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/a8a860dc951cd5e922c523201517689f/rofogazaxonazuki.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/f1abeee687fcd232dd989dcbaadc6b92/33559619141.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/lezududefo.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b54f7949ce2---12753272885.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d79b2f6e1---67388735758.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/60380298149.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/95842029882.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcce7c4772---gezivowosisurav.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/81674813641.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610cd669484cd---66118230923.pdfIn PDF document text
    • 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_off000117ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FF 19104 bytes
SHA-256: 0d0ce31d0f5c560e66affe63de9c9fabcb71cc77c528af00a3ffc59680c03af1
font_01_sfnt_off0001498f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1498F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000161a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161A6 11332 bytes
SHA-256: ecb08e03ba83e60428519f244655dbd84fc2ab9ccb017746bfb6e324a25cf37e

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