Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5218df5e5705e94…

MALICIOUS

PDF

89.4 KB Created: 2021-07-22 16:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 1a6b0a3af8f57e463bb47521cc34d963 SHA-1: 3253b6f661190ac0d72ecf813d965d1106a27131 SHA-256: f5218df5e5705e94893ca3621f50a53e6d8a6df5a24799eee438b6019b4031ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the nature of the links and the 'link farm' heuristic imply an attempt to host or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48181629565.pdf In PDF document text
    • https://easy2ticket.com/upload/files/domalekosipejeba.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607edf623a905---nasaboxat.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/67b61ae5409edcc7e750f64560cc0391/buloxubiwulaso.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086479414190---wozemisapadutataxidib.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098417d1f8ee---riporiw.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc8510cc0c---kiwafogefawubirakaxutubas.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/m7qkf0jgj2s4dvsel8d90bhev4/50635349710.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/20260546317.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/n6oqhlbcl9uk5ppl9dqeon00t7/51719755064.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/13039167083.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160861600aa224---40716636271.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/tasajowegawagoluv.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607986cdc43cb---temafatujibiku.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/18831768570.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870f3b2c89e---sudodederer.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac167e24970---95453824588.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b286e1761d---vatozanajumivenu.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/fazakiverasato.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/zugulononifufazakajataw.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/bodof.pdfIn PDF document text
    • http://brnc85.com/clients/878796/File/xamoxelom.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/kapiwe.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9ac1df4f0---gusemitiwenufu.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/luvivezakesi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=women%27s+intuition+meaningPDF 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_off0000fbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EE 10432 bytes
SHA-256: 6a15a5c25e62033f89cfa3011dfa53648847b0214492a095cfe71c6bc78d6595
font_02_sfnt_off00012bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAE 16976 bytes
SHA-256: 7c06573b9dcc46c4cf37037fa267279f14ae3d237e8a2c896415d456a4327223

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