Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebc1083117ab4ecc…

MALICIOUS

PDF

84.8 KB Created: 2021-08-17 22:11:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7ea9ecfeb1821afad3642638b67100f0 SHA-1: 1d060fc97059bc43fd86d3ea2aca9cfee612296c SHA-256: ebc1083117ab4eccfb95bca2cb23221f26723bd725eb635013c12f2f68f7bcec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a phishing or credential harvesting campaign. The presence of external URIs and link farms further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://queure.ru/uplcv?utm_term=samsung+top+load+washer+error+code+5c
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a4d4c98fd---zobimozoguvaginonu.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/61ac106f8fb1a07e6675823c7a7483a1/65349764825.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/2d44119c0c9bb41f0a950c124ab8048d/wafinibima.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608888fb2d9f4---27430798311.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/9mpjtl5q14f0viutl317jl08sg/sumeju.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3a6272b47---16254877630.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/850eb3d83d6f01073e2466565edfe42e/kejifasunof.pdf
    • https://braindevelopmentmaps.org/userfiles/files/70487472581.pdf
    • https://castilloexterior.org/ckfinder/userfiles/files/takoferozulawije.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b53b45e09---tujunuti.pdf
    • http://bannails.com/fckeditor_userfiles/file/zebilemupakefufiwusejag.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/3mb9f5ganb83qvsm0p7m7egseh/xilelujusetozovitonaxar.pdf
    • http://batiment-tunisie.com/userfiles/file/46494311575.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16093e4da7dad4---39334214223.pdf
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/tojage.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a07a9164417---visatubosadaxogufenadop.pdf
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/legojug.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/41cc5b073258ff83a338120e1d621ac5/sogavuze.pdf
    • https://searchkar.com/ci/userfiles/files/43035090063.pdf
    • http://christschoolblr.in/userfiles/file/duxepatasulatesanap.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/19db07e0539523846ae89a0a78559a07/lifetakozawowisesefinofe.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c560438476f---77717337987.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ad1ce7fd93ee34872bbe5283a047fbe9/56926796983.pdf
    • http://imreelectric.sk/uploads/file/sotefumaloxusomabesef.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e70f.bin
f722c2d48330053e5abedce0faf2d0a248b5db9859082c198a08947ef5435212		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE70F 16940 bytes
font_01_sfnt_off0001132f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1132F 16792 bytes
font_02_sfnt_off00012b46.bin
92993a4cb052941d61a57f3b1ae8ad6f4073d48bbac2f7c260771fcd9a1476cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B46 11264 bytes

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