Malicious PDF — malware analysis report

Static analysis result for SHA-256 98e298eb43846c20…

MALICIOUS

PDF

82.8 KB Created: 2021-09-18 00:14:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 20d0c73e186af0525ffb3e5c62239610 SHA-1: 25346e0f589029fe15c85ac65cc113d8ee385a42 SHA-256: 98e298eb43846c20fbcbf1ba22b4a4c9d337378bcd24c252baaad20f03d04032
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF document identified as malicious by ML classifiers and ClamAV. Heuristics indicate it functions as a link farm, directing users to compromised WordPress uploads and other disposable hosting sites. The embedded URLs, such as http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb86a23bb1---94837405773.pdf, are likely intended to host malicious content or facilitate phishing. No scripts were extracted, but the document structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://globalcenterhotels.com/bot/ckfinder/uf/files/70063627976.pdf In PDF document text
    • http://www.truca-taoules.com/ckfinder/userfiles/files/pafisa.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/27293054150.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/19582085812.pdfIn PDF document text
    • https://longhoang.vn/upload/files/91031776976.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/4195823917.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/cjt0suh30ip5m268ui7jo9bki8/73374273265.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/613c03b21ba30.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/74123072673.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/60768383320.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/febitikodabowedulivisoxa.pdfIn PDF document text
    • https://tch.lu/files/files/mirakosojibowite.pdfIn PDF document text
    • http://seamacros.com/upload/file/wapubakegula.pdfIn PDF document text
    • https://geniodelweb.com/file/venukoladebadajuziti.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/68040827356.pdfIn PDF document text
    • http://hotechike.com/files/files/filapazebekeneduruzipofa.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/87365604179.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/27653498858.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb86a23bb1---94837405773.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/45801083714.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/7d759dce5f40257d96773d5237e2d617/natulovoduto.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/ladofijinojajapavalit.pdfIn PDF document text
    • https://terracell.pt/images/file/pabebafixibinonobunexib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=android+browser+with+download+managerPDF 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_off0000df7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7B 17432 bytes
SHA-256: de25f2e99d9718e69d14b0769bcaad5b64e8f0acbe25c6d7a223722499cae80c
font_01_sfnt_off00010cbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D6 10904 bytes
SHA-256: 3d79407e98194c2239ca63caf30d9216765ba1df6bcd0598a02b2d320d4b11b0

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