Malicious PDF — malware analysis report

Static analysis result for SHA-256 4214a46d71c6fe16…

MALICIOUS

PDF

76.5 KB Created: 2021-09-02 05:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3a6f8c3fb05b12bedbfd5e488f21f234 SHA-1: 3d888ae41dfda65c2231bd6b3c2c0137633ee3b4 SHA-256: 4214a46d71c6fe164667ca36a1054abe19012488887238cd8da171e6c556f9c3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also functions as a link farm, directing users to multiple external URLs hosted on compromised or disposable domains. These factors, combined with ClamAV detection and ML classification, strongly indicate a malicious phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://yokohama-model.com/userfiles/files/97252305059.pdf In PDF document text
    • https://rhodium.vn/uploads/news_file/jedemapu.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/puneduko.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607e01ed94d0f---vixemizuvuzejikulisopumi.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/33833112782.pdfIn PDF document text
    • https://soechi.id/userfiles/file/bulopawobozekakugoxem.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/e5fhs387edfl6oj3sddfq5qu6g/11710200168.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/44097764975.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e307ea87c---rididagetusup.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/429e2d50ad0db2736ff3e308d338d2fe/peburusuvafurozolozakos.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff555e7099---besurafixelukupulaxuk.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/redeloforibujararedor.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/zuxuwolaja.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/a09807a163d841f2a5e2945407765d7b/povozadomesafunuka.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/kaoe1th75fnik4f8vteqld6g6p/veram.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b46a25c9740---14573313563.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/wetojovumu.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210814_123410.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/zomojemuxasujesunal.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/p4i9snkbd6bg7nme0jb8ht27b7/56425738941.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160968ba61a07e---57818801357.pdfIn PDF document text
    • http://drive4smilesontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/fajoxutajeforufafax.pdfIn PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/kitudodunaromadukurubupen.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608709f624bab---nipevozok.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160895a189ac13---mitefomubi.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/gawatefetitiborefunipipim.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaba713a337---70097366849.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=adding+subtracting+multiplying+and+dividing+negative+numbers+worksheetPDF 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_off0000c851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC851 11540 bytes
SHA-256: 737f5e8d40b0769b22dc63ba8d98a6b58ea1db6ee08139619763ab13c318d808
font_01_sfnt_off0000e335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE335 15596 bytes
SHA-256: 7452ed6703065998e05a8e3cbff9cb124c5f2a642f73548d6f05fbf14b460f59
font_02_sfnt_off00010a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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