Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e6b027eb2ef1a62…

MALICIOUS

PDF

93.1 KB Created: 2021-06-26 15:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a31bb6cf473801212dc4b283d6b5a83b SHA-1: fc64fb7c945ebe094e002bbfd43c58074a5ad6ba SHA-256: 3e6b027eb2ef1a628b04e01a0c6693dec5fa1ba01edafbc701f9d9c9db030c25
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, indicating an attempt to execute code within the PDF viewer. It also functions as a link farm, directing users to numerous external URLs hosted on potentially compromised or disposable domains. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful content or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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://pistant.ru/uplcv?utm_term=planting+zones+by+state+2021 PDF link annotation
    • https://sonntag-immobilien.lu/userfiles/files/81262007475.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/24778547206.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/deselikaf.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcd8402f68---57998031837.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8a52e13e2---40435622563.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/ccfe9d4161356d2a8860346c8a32aeea/20072753264.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/55079808985.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/jurakimabegebokamo.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/kepenotomofurawosegarejik.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9dc0a0f33d---kimawabeka.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/6e9vh9a8uc248btj25cgeip3o5/22892087783.pdfIn PDF document text
    • https://hostingalani.com/calisma2/files/uploads/51063327040.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c00b897a4a---43388202417.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bc0c4d653---tosulitovoleni.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ed3043c83---gesakisedivuva.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/56963865845.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/vipemozeretegejotefu.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/9ac17b3b802e6e10a4e28f4fb703b41c/11475502601.pdfIn PDF document text
    • http://nnrhc.com/clients/9/98/980d61ede38c9a35fe3396fb65651545/File/59994643228.pdfIn PDF document text
    • https://dhesient.com/media/95013545074.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f67edeb743---88368505005.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/4482a0faf04ad30d1427fffa4673760d/bufuwinegotuferudivigu.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b82c83f42---49437368407.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/74966679482.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_off00010696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10696 17692 bytes
SHA-256: 3c60e773e2f311c8a60218f69914a5afb4f04b656cbaf2b07c6fe47d48b7613b
font_01_sfnt_off0001345c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1345C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C73 10792 bytes
SHA-256: 1243b5885935a5cfc52876698fd162e980b6824689fcdad874780356221a3156

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