Malicious PDF — malware analysis report

Static analysis result for SHA-256 f420a52011eabde8…

MALICIOUS

PDF

73.2 KB Created: 2021-09-05 20:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e6c284965357138494ee5779de654cd6 SHA-1: 0ac0899e267ced2e1ef713902406e22393a14e79 SHA-256: f420a52011eabde82306c472cefaa77be3732f052b602432e0c972d3998ab776
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites and disposable domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is designed to lead users to potentially harmful content or further stages of an attack. No specific family could be identified.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://aymfly.com/aym_image/files/57899484270.pdf In PDF document text
    • http://valeneighbors.com/userimages/53303470440.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3442367974---tizelirodopitobumatajo.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/xevuz.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25f9f95944---40395095030.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/vakakufaku.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/48109236393.pdfIn PDF document text
    • http://reylab.com/userfiles/file/85149372797.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/pagabugi.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/80358243410.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/57443780063.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b9db96f80---xekesefugelebuxopegota.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/s0q1rli67rg152bk4h943n50r7/53924605980.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/rejofodo.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/kedajekapurur.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/zofofezekisasik.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cff085f06a2---49250062723.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/19314132981.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf65bb77beb---duxenilewugunapajevanidat.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/42968342690.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/569fv06hjfvk9jtupndnnkikgt/99052902249.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/b60f90437dac706fe61f3b37e6a4786f/43698078288.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/71897909640.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/dusolutunabejanusa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=technical+communication+process+and+product+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_off0000ba3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA3E 16776 bytes
SHA-256: 430a5edae99b961381b626eb7b24a83929d49e7f8ce77710e682fb2f7340a04c
font_01_sfnt_off0000e59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB2 10948 bytes
SHA-256: 06dd61775246519456144e686b4ae6fa9efd3bb33e5fe8294cc812f357a7d342

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