Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc5b036794de9bbc…

MALICIOUS

PDF

76.5 KB Created: 2021-06-14 08:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 68ec58a79b7a469e57cb13d9c0a61bb5 SHA-1: c154473c83b11b5517a42e6f44e8530f1835f46e SHA-256: fc5b036794de9bbc02bb3c943645057d44444f615aa2749527a691a62b44c10f
156 Risk Score

Malware Insights

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

This PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress sites. The document's content, though heavily obfuscated, appears to be a lure related to 'Fortnite device support' to drive traffic to these malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crewmak.ru/uplcv?utm_term=fortnite+device+support
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ce084eb7b---delikozirijukakejowabu.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/234d3ca4c0282b301c0deb08d9095cba/jafanoros.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f702812bf8---famev.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082130875183---gagawowawavad.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/i8ihvtku74nthug5v22fekqkgu/35313140827.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ced4b3e813---70255020372.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3945a03a4b---16383303128.pdf
    • http://rld-carbon.ru/file/wusada.pdf
    • http://hpworld.hu/data/pic/Image/file/65762943936.pdf
    • https://fonixkoncert.hu/upload/file/32096149528.pdf
    • http://simonide.org/userfiles/file/vewerek.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/5ec6215136eaafd7ad73ce49b0f740dd/momikumoj.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806779e0a5d---74942678233.pdf
    • https://bczenekar.hu/files/file/30261396749.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/c8d1273bf837ab35bdff592e825347b7/25270223896.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e537.bin
68ea115ce698b25495949c97c6e7294a36843ad728fb1a7ef14b1e3247b73855		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE537 4840 bytes
font_01_sfnt_off0000f5c2.bin
846313b0c2e8f4c92b6ddcf1ad82e22b6562591171ed3dfbc5514cd146b6a921		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C2 1864 bytes
font_02_sfnt_off0000fed1.bin
6b67ca204d49d681b26bce23a9e6d3be87131125cc3c950af2e5472f897c2764		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFED1 11216 bytes

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