Malicious PDF — malware analysis report

Static analysis result for SHA-256 ced3ead1ac1f3a72…

MALICIOUS

PDF

81.1 KB Created: 2021-10-05 12:35:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a7099002b6e8c1471b7d811a62b67019 SHA-1: fc4b85b368a421175df107619df2259921b9aa46 SHA-256: ced3ead1ac1f3a72c3d49ad8c5ff8d0ad02a313b91b0eb6a601da5e1501f955d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' specifically highlights the use of compromised WordPress uploads, reinforcing the malicious nature of the linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://osstemcardiotec.com/files/fckeditor/file/16374436856142776b7362d.pdf In PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/simamit.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/jixolisodewamarukedulem.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/mewesuzexafuduwapofafo.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/f0a57b6b15f57d2c92041b0e854c4d43/18823575550.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/xuwobebak.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/xuzapimezuzigutezobozap.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150f1b758cc3---3853179464.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/69798322581.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/nq5pri89ud555fi0eoc79gdt36/14647168230.pdfIn PDF document text
    • http://woykoff.hu/upload/file/35483458390.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/suxasonowevemekujeved.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/wururawetakolozeg.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/jixiduron.pdfIn PDF document text
    • http://ilkemymm.com/image/files/sapub.pdfIn PDF document text
    • https://tahsindincer.com/upload/ckfinder/files/89671708740.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/wazorub.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/31462616989.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143b79c6587c---lisixofobemepilimemobaxuk.pdfIn PDF document text
    • https://badrivishal.com/media/majuja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=swot+analysis+of+clothing+businessPDF 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_off0000d90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90D 17352 bytes
SHA-256: fe316e59e76dc11f70c5c1581469001e4fc274b6c259479d4d136ea489e1166c
font_01_sfnt_off00010558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10558 11028 bytes
SHA-256: 6f7c588cb912e6a0b6b43d311a25a6282d6a87373ab3bfce91ce3e4f3e75d0e1
font_02_sfnt_off00011f18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1