Malicious PDF — malware analysis report

Static analysis result for SHA-256 04deb0f4d21ccbe9…

MALICIOUS

PDF

77.9 KB Created: 2021-09-06 08:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: db2c9468d7461dc5e34eea5629a66e94 SHA-1: d4ee7c3dcbbdb4b1de0156d6e591be483e28f452 SHA-256: 04deb0f4d21ccbe938c0b1737807f671cf49397de157ff980521e04cdc369509
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The PDF contains a link farm pointing to multiple websites, many of which are hosted on compromised WordPress installations. This suggests the document is used to direct traffic to potentially malicious or SEO-manipulated sites. The ML classifier strongly indicated maliciousness, and the presence of numerous external links supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/701a2d3c39e9f2340fe11da8eb7bae0d/saxazas.pdf In PDF document text
    • http://richmediahouse.com/admin/uploads/file/liremozepunadukeda.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/kogesabugeborol.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609781f575b71---95393152068.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/xelifibefoparobibide.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26528603849.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161166f0fac765---13462738875.pdfIn PDF document text
    • http://susutour.com/userfile/file/rafugafetowivuvuk.pdfIn PDF document text
    • https://www.dars.bg/ckfinder/userfiles/files/tawanixibaxidilabevi.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/bizusemuduwotolodej.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/97328753219.pdfIn PDF document text
    • http://thegroverestaurantnj.com/userfiles/files/zezebitologokosutijinas.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/f51574e79a66dbcec53d8daec3725b7c/digozaba.pdfIn PDF document text
    • http://brlairport.com/images/file/2004917841.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/63247046759.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/xugezezanedomoxufukurexa.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/dunedapifimilaxaluga.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/98519071656.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16089f0048b399---48680058238.pdfIn PDF document text
    • https://blokhol.com/upload/files/veneji.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160af95246c56a---fonabizelul.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/fenudasijiwuzara.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/70071444880.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210903_E3986868A82B4981.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=mandala+h%C3%A4keln+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_off0000c73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC73E 19380 bytes
SHA-256: 60ce55c31c22621b882190060daf28406bb0c087a04610aac77cdbf70bec2ba9
font_01_sfnt_off0000f977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF977 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001118e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118E 10356 bytes
SHA-256: 506f6c55a5a5aef9b358efa53cd2914b4560b99c2f07de8e2d95d20fb9dee7b9