Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccf0f3cf5fa054cb…

MALICIOUS

PDF

71.5 KB Created: 2021-09-10 15:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6fde04f44ec32b8ffe87d887357d8e16 SHA-1: 1cb3f3794d58cf9213ddec52b274f53faed940be SHA-256: ccf0f3cf5fa054cbc53fcd865bf0c5a25b7e07398f8f9860002a22e8ca9c0e37
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised CMS uploads. The embedded JavaScript likely facilitates the redirection or further payload delivery. The link farm structure suggests an attempt to obscure the final destination and potentially evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134624252fdb---35483100662.pdf In PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613527cb611aa---69975257023.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/tubefasivukuboronaku.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/binuloralefi.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/fulikodasapalapowilobeji.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/mexovivexup.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/furumasezibezowoturus.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/95726947833.pdfIn PDF document text
    • https://efnnma.org/files/file/38804526866.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/39014779164.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/56242492878.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/xoxaga.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/legewuloriroroduza.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/runuxafokowazoxotudo.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/pujosatakis.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/dedexuxe.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/rejal.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307bb038d32---3956008971.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/nokevojujavezu.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/91532146409.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/72467838391.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/kokodedababosi.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/28623222604.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/35967781134.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=the+hite+report+free+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_off0000b466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB466 17652 bytes
SHA-256: 7f9e4bca8f719d6878fe82e0a84d592fbeffc40d628769a13efc2d0cb0913aec
font_01_sfnt_off0000e171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE171 10080 bytes
SHA-256: a2d638870b0e71c9f9e615da35f4cb38c1d0cf2ea723a8b46afad0bd29120c08
font_02_sfnt_off0000f7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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