Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b324bd4eb9890b4…

MALICIOUS

PDF

79.0 KB Created: 2021-09-04 16:55:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f23703938a09e7e7ca28562a6a207d1e SHA-1: 73a041ab9f20ba96acd682c852bed8a9e9e7c557 SHA-256: 5b324bd4eb9890b4c2a8ead2043de3dd80f6c155f6b7578a2356459f09bff458
156 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external links and the nature of the hosting suggest an attempt to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://resonanceacteurs.nl/userfiles/file/pofut.pdf In PDF document text
    • https://liur-krd.ru/userfiles/file/11670935235.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/63856529972.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21732794517.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/sivug.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/sebemawafelekunepitifu.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/zunowomiv.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a904870a1a---gimimepexugeporekesipe.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/97814315770.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/gamegetorepezowafe.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/29757692295.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/lepurolafilulavupiweder.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/kinatuzalesojuze.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/zimilekipiwedejegijefi.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/vusuwodivef.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/kuzuj.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/66480514018.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ab17bad60---92653229883.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/gajofabanet.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/21086448210.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/79305419079.pdfIn PDF document text
    • http://sbairs.com/datas/files/79415339018.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/65120125218.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f243b8391---somapotafasiromedor.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/83pr2vnhrjj8t3g14mjcjucu7u/piruwo.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/xozenus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=second+national+development+plan+zambia+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_off0000d11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11B 17264 bytes
SHA-256: a26e2e2882f0d0f088675390acb81a471b3458031b2398de8b33b46ccf4ddf52
font_01_sfnt_off0000fd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5C 10856 bytes
SHA-256: 199351f941c0cc0312bb35ad21d43ef9011c53a3b6dc22689a6fc10512997295
font_02_sfnt_off00011646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11646 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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