Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbf36240d3fdad7a…

MALICIOUS

PDF

84.2 KB Created: 2021-09-14 01:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 93d16a71dcf646ad0ffeb72eda0bce27 SHA-1: a182b1be16c6007c7155141de25d92fc51becbc0 SHA-256: fbf36240d3fdad7ad340e0e8a8a534ca73d124f14a23b011ddcdbdd7c2217200
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm or redirection scheme. The ML classifier strongly indicated maliciousness, and the presence of multiple external URI heuristics supports the conclusion that this document is designed to lead users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 5

  • 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://inwebjor.ru/uplcv?utm_term=fundamentals+of+futures+and+options+markets+pdf PDF link annotation
    • http://studioarchterreni.it/userfiles/files/livovuxolarekikurenuzuse.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/xajeloxexanixelowi.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/wipotaresasaj.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/famigawejitopoxo.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/dogefodabebuwokogebero.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/nujuxezulaxemivowutesusiw.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/48103653959.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/zatelaperipowemej.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/92940060543.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/950286736.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/mefutejutul.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3d28b414e---29057594389.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70729035600.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5e60b646a---76012891996.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/negobixapisanugofafu.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/9a848de541bbf65c4a5cea945ebe63d9/67092721288.pdfIn PDF document text
    • http://cochemical.com/upload/files/rajemixukonibizezebu.pdfIn PDF document text
    • http://manu-transport.com/documents/file/64002334218.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/gevizi.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/kedudutonevarulexipazize.pdfIn PDF document text
    • https://sapporopools.com/contents/files/99501429738.pdfIn PDF document text
    • http://vps73.juicy-group.com/editor_upload_image/file/difomebiwesirezudug.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-11/20210911075241513631.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000f26f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF26F 17936 bytes
SHA-256: 4d4c5810c1411f4bbe41b3a0543cd2d5935c1c5b801e9021b6dc89b0d3f8d173
font_00_sfnt_off0000c16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC16E 10828 bytes
SHA-256: 12a4824ce6e1fd6c07591f4db1aa6fe2ea0327bb5dbe8d95c822d81b53a4cf66
font_01_sfnt_off0000da5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00010e4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4E 19528 bytes
SHA-256: 4fe490e547309bdd257f7d8dd92f4a822b52e5c75825e64bbf9f3507e8c70aab