Malicious PDF — malware analysis report

Static analysis result for SHA-256 d352ee95910d6b14…

MALICIOUS

PDF

71.0 KB Created: 2021-06-08 20:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4073cb777dda97d4211c5e12578905b8 SHA-1: 7099167381679f06eb00370d9fdf41375d7a0407 SHA-256: d352ee95910d6b14fcbaaf3e2925638c299c4bf6c9a6f0879a1f84f57f0a42e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing attempt. The document leverages a lure related to passport renewal and hosts the malicious payload on compromised WordPress sites. The presence of external URIs and link farms suggests an effort to distribute the malicious content widely.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://medvor.ru/uplcv?utm_term=irish+passport+renewal+application+form PDF link annotation
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094368948a7b---jarijusukujilet.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/d55bd8cf8ff1b4c2882dd264c303e4b4/gilunupoxutipe.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/c4ac9709857529b9577116609cfe00f6/778626510.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/f8fd09cb505065f85c22f6277d85919f/83508048335.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/4e7k28p60o9vnctjnqp4cbma9j/telukod.pdfIn PDF document text
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/nokab.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/vtn46n8m5hcbcqkglfucoagoh6/pegokagoniredapuru.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/1f55a00632a43185dee5025fb9500505/57822009910.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/vajodosopizuvivovaz.pdfIn PDF document text
    • http://strandedtattoo.net/file/vulegiwenar.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1fee99ff8---23462118255.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160741ffbc0558---74695823770.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/gefim.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608458b4827f1---rexodedulifusulet.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160774db371e10---givuxaxokozujaw.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/12438968583.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/resaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F1 5284 bytes
SHA-256: 04860b7721ec1da27807a7bce7c05178ab5f84cc554aadd9c0ebc236d3f7da23
font_01_sfnt_off0000e8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D6 11292 bytes
SHA-256: 9d4164057bd6284090fe72b8806594d43f3a7169935c74e5ddda0edbb7f5d9bc