Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea9bbf89a2ef8c53…

MALICIOUS

PDF

82.3 KB Created: 2021-08-15 12:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: a56f77ac021e2a30dabc9dd79a03abd8 SHA-1: 6cd2a0ba1b9c9557bac2c12bc408c6956d25a737 SHA-256: ea9bbf89a2ef8c53a73aabb8befce8204afd68b2f31982480c77a2ef83b81fe0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised WordPress uploads and other disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, likely facilitates the redirection or further payload delivery. The primary attack pattern observed is the use of a malicious document to lead users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://huntic.ru/uplcv?utm_term=ventajas+y+desventajas+de+los+costos+predeterminados+est%C3%A1ndar PDF link annotation
    • http://anhuicrew.com/upload_fck/file/2021-6-21/20210621210756346119.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/xexesujomadej.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608affd897aed---kitipozifo.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/10099191229.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/78527351283.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16070f1e50ecd8---marepesogux.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/648cc0db362dd7c715260b284ae111f9/kosujowunuzivarixufodaf.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/81519629599.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/6rr75ir8l1miimj104nploi0v0/1094924198.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/gamifaxoge.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f89b719a9---22536370573.pdfIn PDF document text
    • https://mmszke.hu/files/file/melosofikulana.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/6cc426355c56b284cbdab23df04cb24a/91818110650.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/44531794834.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/61981259948.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/cg8namhapfl45aveopnjdvt345/nopidorajexalebekoju.pdfIn PDF document text
    • http://zimmerei-possert.at/sujovegowu.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/rurawejajaseterisediso.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210620115740_1227398024.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/921486939.pdfIn PDF document text
    • http://mueblesdepladur.es/1/userfiles/file/jerogemal.pdfIn PDF document text
    • https://datajournonepal.org/files/48668945405.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_off0000d999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD999 11136 bytes
SHA-256: 4e17f7626db099c2f09122407a3c773ccbdada38a6e13ef624b36db8778b2894
font_01_sfnt_off0000f332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF332 17632 bytes
SHA-256: cdd8ae23b46e3d785a8887cdab77f0cb4cebad959724816fe5d5ba069c0d8ccc
font_02_sfnt_off00011fc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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