Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5e4aff97486d35f…

MALICIOUS

PDF

80.2 KB Created: 2021-09-09 18:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d938990681cd1a993519d1e11ea39513 SHA-1: 40cb73f749413debaf67b5029f311f097c44cd37 SHA-256: c5e4aff97486d35fc282ea433d5707d3fce6d8b1f3e9efd7ea93c20b6e6a5eb6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://ural-aiti.ru/admin/ckfinder/userfiles/files/68904102085.pdf In PDF document text
    • http://i-physiology.ru/upload/lubibabogomog.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/mozotosukesazugoku.pdfIn PDF document text
    • http://nhadephoanhao.vn/upload/ckupload/files/kuxidoka.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/31658708276.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/17981929914.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/82326913439.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/40498450664.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/suviralug.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/muwavapimo.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/38287243358.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/80116551751.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/rugawiditafijogamuxuxi.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/11172523456.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/509aa268de42e876c8dc459b25d929b8/masiwuzejazatonoxobul.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161325da9279aa---63785141587.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///52583572549.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/90856c0f360c26abfced25f41e2bdfc3/12667996583.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136dbb2912f8.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/24483810020.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c53730b3c---waped.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/61089091076.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/duxejadegifukagexifofifo.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/ruvepebo.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16139f99a82dc8---87474105446.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=notepad+in+my+phonePDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/bawenuxeluxenol.pdfIn 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://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_off0000d16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE985 10436 bytes
SHA-256: 5beff2cecb5528693574068bd946bc9ad5c7aa7cce4e71aee54ec4bc31de7d95
font_02_sfnt_off000100f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F4 18924 bytes
SHA-256: 5fc9aba9c953e99769eed5627f4815632b2d2b7d67ca4527098f758be06d1668

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