Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5aec52f9b763348…

MALICIOUS

PDF

84.0 KB Created: 2021-06-18 06:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 6228afb89fa56cac59377a6ab002c7b1 SHA-1: 21840cc2b6ce8d76516d1a867f963090f36c7155 SHA-256: e5aec52f9b763348f550873d998d02b1f843b7267c34c60666584bc6333f4e7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous links to compromised WordPress sites, suggesting it functions as a link farm or phishing lure. The document body, though heavily obfuscated, appears to contain search-related terms, reinforcing the idea that it's designed to direct users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://chcial.ru/uplcv?utm_term=how+to+turn+the+lights+on+my+keyboard PDF link annotation
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bf4e1cfa6---91081202949.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/60022315567.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077fe4eb32aa---pafudiba.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/f99b68eedf2867a4158a5267c53289ee/wunubejugowiwavajoregak.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/909d2170caf547d849e8a74092e777b8/fopeguram.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/ad2214f54ef267be2cc77920b2050982/buvomopizukepis.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/j4o643b7kbpvp3sm2i9quol584/nopizexegowazedobek.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/99186832682.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/taxolozuwudokitigize.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/senon2af6j0g49ugl6ubf40522/wagokuwez.pdfIn PDF document text
    • https://angkagenap.com/contents//files/65495070715.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16091b46c7be5f---95317115853.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aac99346404---40669156642.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160bcaa9827bf9---48037578473.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16093cede14bc3---wedebosu.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/tpp81u60f9qj3rurrgclscdgfs/gonulotaxipatafufinu.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/xanuvitikexibosobak.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/5f005af00205df7ead2c935d16011131/4210706512.pdfIn PDF document text
    • http://www.typoland.com/http://www.typoland.com/designers/Lukasz_Dziedzic/CopyrightIn PDF document text
    • http://www.typoland.com/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C2 6168 bytes
SHA-256: 9f07a400e75c177e496f395344003d4a7545e118b36bf59d530d47f9bb3550f8
font_01_sfnt_off00010961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10961 5600 bytes
SHA-256: ed3571f5b8bca3766e40879ecbae2c0482260bf2b82360ae4bd86ef8353e4fd8
font_02_sfnt_off00011c5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5A 11444 bytes
SHA-256: 58a2c33b1554e6f7fb1e8a67080f5e7126bd1c00289b32761be6624dca77f763

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