Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5e596de007f4b45…

MALICIOUS

PDF

80.8 KB Created: 2021-09-04 12:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b3ac3f9b6b6276e32b86bf3e13dd47df SHA-1: 90e3a778ed22c27e8b26ce98713409a238d09c26 SHA-256: b5e596de007f4b454b3c8e93c2e7c4c11ef1186a63cd96034090b4e7d54b9ce2
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a pattern of using these links to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/u6qaen5rhcugnnlqj4kb11o75p/supagesubasokifid.pdf In PDF document text
    • http://party902.com/images/file/36218038149.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/1204947175.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7e1738b03---59196639659.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c237d7a5b40---nerikukojitu.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/5259810510.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/682034e22c2c465812e0abf2fe018000/duwawal.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841e6ce374b---62503761422.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/danel1hm7at1busdabmuloka49/nowodidogeragoxup.pdfIn PDF document text
    • http://novafish.it/userfiles/files/38048075586.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/damuveze.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609231f620475---rigijilu.pdfIn PDF document text
    • http://artospace.com/pics/file/71046868588.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/es2n1683nfq18dvucggdcoqet7/fiwedikezulibaxuvezaferi.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a3b3d3eca---boxerulamugukigimemupaj.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160829be0e11b7---refigetexotulodelu.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16089fa9c4087b---rowujonozoxikijixaku.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/d0b779048b22752d93b3a246283cfee0/37432642729.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/41287319567.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/37975839582.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/55742024633.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/2882686260.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/8561821257.pdfIn PDF document text
    • http://apsons.eu/files/file/jadawogo.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59750676172.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=ec+8661+vlsi+design+lab+manualPDF 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_off0000d7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE7 16876 bytes
SHA-256: 55eaebce11c63f9339ec24196fb199f38b27d1b8e9ec82e37dc067d3085f9bb4
font_02_sfnt_off00011b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6F 11112 bytes
SHA-256: c46db0b02277e282751bc9b140e36025635a5d4e96efe59e399254807b254aad