Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e2cfb21068e4072…

MALICIOUS

PDF

74.3 KB Created: 2021-06-21 12:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: e1b53f7c200c7a739a5a0749d1a10102 SHA-1: fe804b550ecf239eafc764c9ba89bdcbf1eb8a37 SHA-256: 7e2cfb21068e4072c119faaad977ea094ad5f688c212bb18677f095ebdb7d14c
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites hosting PDF files. The ML classifier strongly indicates maliciousness. While no scripts were extracted, the structure and URL patterns suggest this document is part of a phishing or SEO spam campaign, likely intended to lead users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/e431441a44c32b964f153e949b6a3c16/duzebefejagiwijanuxak.pdf In PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16080c9eb96207---86555422070.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b21164f006---27058136398.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/892bca32761b9715fc5692a7cd60737d/kibogivuzikixalu.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61648b3cba---lemimokixog.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/75abff7d3408825d4a04dac638ce8106/14456488769.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/r86co8j99c16u0te33tiqcluvn/pipavexisijamuwetixixi.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9650b1cb6---27326748375.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/37243371759.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/53011177215.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210618040925972529614.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e9fcbd78f---1229569696.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/sonapejugeseweb.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/25888432619.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607df717f3ada---37576794474.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c65d1011e6---dutabapijozenor.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860a95946a4---7202543901.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b6671e67---zakejiwumajagututazexu.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/texojerojakegufomebasup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=what+do+chicken+eat+stardew+valleyPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE566 5356 bytes
SHA-256: cf7f7641d197b5855ae583159fa46b2305b151d2983defdac88fd84a4ca4d32f
font_01_sfnt_off0000f7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B7 10728 bytes
SHA-256: ae934b83786e5e65cba78ff7f4ea63b76567af9794ce4e65748a8f3263d0621b