Malicious PDF — malware analysis report

Static analysis result for SHA-256 611e7fe182e54121…

MALICIOUS

PDF

70.0 KB Created: 2021-10-02 12:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2bca465e05e5e04ea12056942e233686 SHA-1: 9ad83d377ae7e95d1eecd291b1a68df563e13b25 SHA-256: 611e7fe182e541217f0fc1e0c90033039b684d008c2b9c6e3b2531b9a525f9da
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the links suggests the document is designed to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://klick-tipp.info/ckfinder/userfiles/publics/files/29468771038.pdf In PDF document text
    • http://moonlightmontessori.com/upload/files/rewuruvubisugumikeke.pdfIn PDF document text
    • http://ipllaser.in/uploads/fijerefonupugonepi.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413f944385e---jepupakujisopimepi.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c04706cb1c---42622740971.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/n8mrifb35b4ej4b17eb520ih3q/18345310161.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/midonojogedilorelo.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/tidul.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/nonetagijojedo.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/04afb2472642f107a200abbeb095b653/vewekokajivu.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/feresasuwikopisuvularowo.pdfIn PDF document text
    • https://codecs.ro/images/file/mevuxawagawev.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/39596342354.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/96576588977.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210929164908.pdfIn PDF document text
    • http://erictex.com/ufiles/files/68002425735.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/sibogujitelefibofogodewe.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/95524948428.pdfIn PDF document text
    • https://digireg.org/upload/96588009746.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/kugibepapofimavepi.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/13877103541.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/pamexim.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/74573843587.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/78569866771.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/55712892453.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=isf+training+record+bookPDF 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_off0000b3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AF 10788 bytes
SHA-256: c95bed2c056b967f7b4e707a86982d148be1432f593868fa1c43f606ce3bb463
font_01_sfnt_off0000cc6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6D 14892 bytes
SHA-256: 979b08149af9f28d447ea157a5489046054631ac0d8b2eaf40d20d3a83d81d7a
font_02_sfnt_off0000f225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF225 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1