Malicious PDF — malware analysis report

Static analysis result for SHA-256 b452c615fa166753…

MALICIOUS

PDF

78.9 KB Created: 2021-09-05 22:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 506d34e65f9140bf31c9bbeec26a1932 SHA-1: 0cf2c61aa9251bece0329651668c53867abb9e5a SHA-256: b452c615fa166753e21538ccbc41f3a3d654a8b9ba8fd5eda37aa0ed9ee9ed44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://cleaner.pl/userfiles/file/vexorajavaxedamezedi.pdf In PDF document text
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/37161619165.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/guxokebinuzaxibumusovar.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e822d191129---nisakadokolelokixalan.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/96919677355.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/farana.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/eb49a5110f5d79b3725fe2c327925116/13434120417.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095579d7dd5e---40153492426.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/63115703740.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/28591137538.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/79458587815.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bed32147b---8809570145.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6fe40aaa7b---duwulezokekuvuroful.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/bibepeb.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/kixuzezavagomixonomizevud.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/20287062196.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af59a45961a---vokigojafonizufa.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/zakifokokon.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/xizexidifu.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c67e4dbc2---vuxububipom.pdfIn PDF document text
    • http://hotstamping.pl/files/file/7123103117.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-08-07/210807100023745813k0yscbcmkxlx.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=eutectic+bonding+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_off0000d2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D5 16896 bytes
SHA-256: bfd347a1f32fbd866a3d96fe324432b3b0d5ee6da96b20f1c34f45a7dca986fd
font_01_sfnt_off0000fee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F7 10540 bytes
SHA-256: 68123bad04cd55de1c69a290b545c4b0d78196e34dbebe436038a21927c8b5eb

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