Malicious PDF — malware analysis report

Static analysis result for SHA-256 e667c545930be76e…

MALICIOUS

PDF

79.2 KB Created: 2021-07-28 11:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: fa035bdd54023a4a3692321f9f685246 SHA-1: d2a4ccfcb8a4aeab242ba5d3bdef7f047e415f2b SHA-256: e667c545930be76ebace7e3613aa1e3b587ba6c26bce5a65221ebe9846e4d593
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to obscure the final malicious destination. The PDF structure itself appears to be malformed, with duplicate object bodies, which is a common tactic in malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://bkdesign.ee/userfiles/file/62959786001.pdf In PDF document text
    • http://cestovni-postylka.eu/userfiles/file/lujajinesesilivi.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c68c24381---pisezazilogunejonukufov.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/10092526504.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/15959394503.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/lelujevibelugusanezodimof.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/462b8aa41e5b331506658c19ff5f5491/naxoritinedibol.pdfIn PDF document text
    • https://brs.jo/userfiles/files/pakimolibirudalegudun.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/37068421842.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8f9844ea9---40425245402.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606dd8a8e08e7---govupepurirugeneso.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/25638231618.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1606dd6b60f477---15701633975.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/82c477c88826c1f22fa91a08a56edd0d/60012496767.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/202163167361422.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/u9qd4pit6qv3nv7k3fkfob1t3c/11460671251.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/81928769835.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/zatirewuj.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160781e2312372---dezuzov.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/tuximegeroxanugaxazod.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ea45853ff---50016132354.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/pedimo.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160720a5acb4f4---40858819836.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8a7d5440e---gaxuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=les+nombres+jusqu%27%C3%A0+9999+cm1+evaluationPDF 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_off0000cdf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF5 11368 bytes
SHA-256: 6101df00776f61573a0276a3e4838a156e9aca85d63576ce9b1d2d2aaefefb7a
font_01_sfnt_off0000e86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10080 16984 bytes
SHA-256: 7a70ed51d19071317e4342b6c825ed73980da17d8fd389028272e32e778a330e

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