Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e7e85401290c7ec…

MALICIOUS

PDF

121.4 KB Created: 2021-07-20 10:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 14045c3db9dc5d141cababe08082be57 SHA-1: 5142f345fd22cf50605b316a4623318964dda2fe SHA-256: 5e7e85401290c7ec715b0614069d29a3a380196f40b8d84fe2ff0a3c15139ae7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised WordPress sites, indicating a likely attempt to distribute malicious content or phish users. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs, many hosted on potentially compromised CMS platforms, supports this assessment. No scripts were extracted, and the document body was unreadable, so the exact payload or final destination could not be determined.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9828

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://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/44ad89bb0b126de12de77e974a182ce2/fimopukifirugirinonufo.pdf In PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607605ddc72c7---28318801272.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f36178673---20239760267.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/3baqp8mrhpddq1a66fjejloebn/moragutowelugu.pdfIn PDF document text
    • http://lhs75aa.org/clients/0/08/08eb77d093c5251d787cf05842b4a73c/File/6374104218.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/jugisababalus.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/59424299671.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30bd1c7ae0---58057645983.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/80604413351.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/sewuzonowonunesanuvuk.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/57531133998.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/50475865511.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160764b6eb1de2---xifoxid.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/b1e276bdb12cd4c4f2148a70ab3ae36c/zujaworosodimazisumulowam.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cbc5648b159---5560451398.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a5030d93c---kiririrunigav.pdfIn PDF document text
    • https://paymentor.nl/uploads//file/xogitareruwulori.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/kadojonow.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/waxesu.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/dumikuxotuj.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca75d8e6b---94192565031.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/e267954c1185fcfb8f272f14ed467905/zobigedupu.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/70404494318.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106111047.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/xesukuvid.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/63a6124f0d30b9e946055f169c83719c/60919995295.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=starch+is+polysaccharidePDF 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_off0001777b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1777B 10696 bytes
SHA-256: ea26315fcda7cbbe91522d90ab3ac734d5c50db33d10dcb8828f339dc7e0b69f
font_01_sfnt_off00019025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19025 18388 bytes
SHA-256: 8d57346d610510f949d05162b2eb807b99c6110d782492fa83378d097a05e7fc
font_02_sfnt_off0001c043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C043 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1