Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe98faf12466ac5c…

MALICIOUS

PDF

85.8 KB Created: 2021-09-05 03:12:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1ad648480fa606cde3fee9e6bebb14ab SHA-1: b6e97f1bff51ebbc4e12372aac7eba9fcf4d8743 SHA-256: fe98faf12466ac5cd48b85d7653f6dd14dec7ca8b1db61eb6b781056bc17c7db
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress upload directories. The ML classifier strongly indicated maliciousness, and the link farm heuristic suggests an attempt to distribute malicious content or phish users. The embedded JavaScript likely facilitates the redirection or download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://aradmissions.com/ci/userfiles/files/87174158694.pdf In PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0a87ed193---34222883037.pdfIn PDF document text
    • http://akademibt.com/resimler/files/zutoxamezisezun.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/45654230199.pdfIn PDF document text
    • http://iphysiology.ru/upload/88084980819.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e975fe07cc3---59969485042.pdfIn PDF document text
    • https://eternalbliss.net/file/59397087920.pdfIn PDF document text
    • https://aedwea.com/upload/foto/61411201809.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/17448148400.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ac37ba2de7b51df1cdf3ddf7cccd52db/34182309400.pdfIn PDF document text
    • http://southeastern61.com/clients/0/07/0748cf78e2268043913ae7c14e09e996/File/91904427711.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/a85a3d13b54ffc9e3242066fafdb3714/64003651601.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/68990154102.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0adcba437e---febemusibozexe.pdfIn PDF document text
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/rebutaronej.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/dd5ff521de3392e94ee3a0dd708d6544/wubikipejava.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/99122646694.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/12034222952.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/devobovuna.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/topigumojilufe.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/87208756369.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/50001915555.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/282115e4d4ae7a354766b0625d196bd8/kajironugog.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/54944805590.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843dbd80948---62009841055.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/81421889400.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210816_67A7C8F5FD915EBA.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=self+balancing+vehicle+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_off0000ea83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10295 17916 bytes
SHA-256: 014fd74b1a55fcb055a297f06b5182820526e685cff7b733c68b1b644a7f6576
font_02_sfnt_off00013157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13157 10696 bytes
SHA-256: 86cf2d90555db3b4a17c5ae532e8fc66cce2a12cb73de1106512172bc4ecfb5c

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