Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d40d5f5fcab574b…

MALICIOUS

PDF

85.1 KB Created: 2021-06-25 15:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 2112e2869ab09946ccab94e1a00d3608 SHA-1: ff0c35b200958639792d95bae0acfc50715349d9 SHA-256: 1d40d5f5fcab574b460cb48b3e1c1f6f96929b2d3e48d20f8c086b6873ef9ef7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm hosted on disposable domains. The embedded JavaScript likely serves to redirect the user to these malicious sites, facilitating phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://krisoc.ru/uplcv?utm_term=things+beginning+with+y PDF link annotation
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/xabotiponiladesuvovasu.pdfIn PDF document text
    • http://altinay-law.com/images/file/35405939021.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d226d9d36c3---zipusesobekiwe.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/midefelilubufinupifamo.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acab8672162---tenosifaditenilu.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/2f2c5290dd76639555673a479a50c331/65737953052.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bfb4f0e4f3f---62086153778.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b34a86380---tunesobupobim.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a05ff75bec---56779345169.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/c0utubc7pdtoj672ph5vefafm7/tejirowuvo.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/1960188990.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d54aa33201---kogago.pdfIn PDF document text
    • https://tidaksusah.com/contents//files/49359308880.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/2f1323ae2a8781ca29f4c3af146219c3/71725848562.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af857fd5154---68119462931.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18ce18532c---85903358681.pdfIn PDF document text
    • https://nhorizontours.com/userfiles/files/62219498051.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_off0000ea18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA18 17968 bytes
SHA-256: 4d8223ef68619b49bbcd9c14f13f6ef646b6970baf65226aca1529ed05ba4fc3
font_01_sfnt_off000118e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E9 10260 bytes
SHA-256: 9e79beb79de98f99d05a81bd6b151020b58f36c1ed2d29ef5e33fdff6ac5cdd4
font_02_sfnt_off00012fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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