Malicious PDF — malware analysis report

Static analysis result for SHA-256 b500cd75ec383c96…

MALICIOUS

PDF

78.4 KB Created: 2021-07-09 01:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: afbedcd757b87462c4cd03fecf37b56b SHA-1: e3e8fe23ebaf846fc76ac0603bb300cb32a506f9 SHA-256: b500cd75ec383c9601aacbd0bef8f8309874c2eec4764f12f3ede0b464416f2f
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript, indicating a potential for malicious execution. It also features numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/rexuv.pdf In PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/89407549849.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb3a618042---rozinarolodafasafobafopaw.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/63827519254.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/lojugajukigarulevisanodu.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/janonononosetivedevogedad.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/e6b5dd8b88e0d59c26f6d97370c4e065/wisilumegimajeb.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/96235832642.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/f00b51305f0f2d6fa70e4509c0a0529b/45695555440.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/e7bbe4ba0cc87f900b0eb95764af7fcd/45733149074.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/ri7833tdsbvm5hsdks7bc7gcs1/44479387502.pdfIn PDF document text
    • https://x-software.cz/data/file/zanedofujemirozaza.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e39d162f9---53172686903.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16093a17c792e7---lavekoxonar.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609453db56c39---zesefunapil.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/ead57918927dc8cf369aa78a2fb26bba/nizivabes.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/88603936966.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/mmgcn514d9edo3qgum0lt8e06a/vofapajinazeripunovunogen.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-7-4/20210704084421259308.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8795b2a8c---nupotafelugofup.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/guseva.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/486135673a4fe4e76d794e3bde37bfe0/kolenuwefiweluvoxaj.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/64530414683.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/kunekozeke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=pdf+to+ppt+converter+for+freePDF 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_off0000d0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C9 17092 bytes
SHA-256: 4af072dbf07980fb20da1d50cb9b3068bc2856009c41959d21b270905e622ad5
font_02_sfnt_off0001157b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157B 10212 bytes
SHA-256: da90c00d9c4218c45c00097634bb345e48a63829e4836f5b3a4fcd6eb17f95e0

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