Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa75d55db2096ad6…

MALICIOUS

PDF

70.8 KB Created: 2021-09-09 13:36:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3f77df19decd0e937767fb0ab18470e9 SHA-1: 6f499506d4e2920d8473d5cc938cd99e43ec19dc SHA-256: fa75d55db2096ad697139e030661dd4f4358e47105f04117e45671c34cdd773e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613104cc9105f---wirolataxamumimefowisefol.pdf In PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/83044011504.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/6259753778.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/30237012505.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392b618bb60---17411919378.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/43452806486.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/mubuxosu.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16139b2922a0b8---30061335285.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321e4c8a72b---22593180781.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/movomowaxezagugusin.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/nejamonusowagifinote.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/javepebufisumemubulazupem.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/82241632576.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/31579470844.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/pilukasubodibiwagimijino.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138418193266---82294681940.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/muriwomazapomoxixunaxo.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/lafixaguxagojitos.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/68126297953.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/mefipesarozekivuluzasi.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/xenozoxovufimato.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=20+amino+acids+and+their+structures+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_off0000b4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4EA 15480 bytes
SHA-256: 9672cea4a100f31b8eb43428f48c0d0cdafb9e326e4cfef66fc8382e9d93836e
font_01_sfnt_off0000dbed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBED 11084 bytes
SHA-256: 0d4f7e0e4d134f23e3bbc2d60472c474e9b98ee0f5e446ead894041d07d4e5c8
font_02_sfnt_off0000f59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1