Malicious PDF — malware analysis report

Static analysis result for SHA-256 76d11288facee37d…

MALICIOUS

PDF

88.1 KB Created: 2021-09-03 05:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 50bea5f4a72564212949e80c6620cd35 SHA-1: 14465c4fb7bef20f1e8cda8d3c7103038edcdc66 SHA-256: 76d11288facee37dd4d8b67bb6cb09fc06561c4fcaecae1b38129c80292b36b2
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The file's structure and numerous external links suggest it's designed to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b90c30f02---legamibebedeja.pdf In PDF document text
    • http://xn--j1aii.su/userfiles/file/82523693506.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/vikas.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/26073359851.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16082284fc3be6---dukamimapokateja.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b5fc8fbee5e---72210231558.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/turirufuxum.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d66e126b1d---politofowikasawibidow.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/63166002334.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/26884952293.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/debuwumajomedadotuded.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/tuxemug.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609849f5be267---kageni.pdfIn PDF document text
    • http://www.proyecpapel.es/ckfinder/userfiles/files/55546586864.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c98c675ffa4---13276948337.pdfIn PDF document text
    • http://woodwaysindia.com/uploads/wukapafaxojokimifobikik.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/33npjoubhhpvi8ih0rhghuje54/56446645162.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/senofavodamakaze.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607579bc5151d---zaxorusixupi.pdfIn PDF document text
    • http://chikatere.com/Upload/files/87920362582.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160780e3484c3f---botugiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=infecciones+de+vias+urinarias+en+diabeticos+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_off0000eb5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10373 10824 bytes
SHA-256: 74b760cced195cf364e5942509f3ba4dfc947573007c28b65f0a0e8f4b365004
font_02_sfnt_off00011c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C60 21864 bytes
SHA-256: 9842503980afea2894ed8fd595ce112f3b3a125c4e4ecf0b820111b531449009

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