Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b9890af3af81d77…

MALICIOUS

PDF

83.6 KB Created: 2021-08-17 17:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2b0d693851f681ff40b94da87f7a20d2 SHA-1: 686a46179e107d3e472566854f4bdabc4ced42ba SHA-256: 8b9890af3af81d77ca49a62219e39ba689e5e261f5291803258b84f44914a3ea
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to other PDFs hosted on compromised websites. These linked PDFs are likely designed to lure users into downloading further malicious content or engaging in phishing activities. The presence of multiple compromised CMS upload links reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16098cf15e19ef---76986992643.pdf In PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/rikigegepiv.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/wirobetusujagememaguzo.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/72260673288.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/35296654253.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/tuxejepebesozosofikejo.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ac4c64ba1---jonopijuzelevevutib.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/fevumipubobofenezomige.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/67166070339.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/cqcrjvgaqupoa715s3327u7492/93714069603.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef313e5897---42864642631.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210622153648.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/56098042308.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160819ed2ab721---jasutavibexijavini.pdfIn PDF document text
    • https://faprosid.com/file/1868937346.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e009b258680---sawugim.pdfIn PDF document text
    • https://lavineriablend.it/file/72070534770.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/e9q56qg0fgiur8h6ve7ja7u4u7/lorivibe.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/31823184708.pdfIn PDF document text
    • https://jensbrode.de/files/file/93408097922.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/96806010288.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/b2117a1758f42ba586c1609023260953/53306060790.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/joxifusogevusuxul.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/32403530359.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=ejercicios+figuras+literarias+soluciones+3+esoPDF 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_off0000dde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE3 18436 bytes
SHA-256: 742422e2dff7b39c6b60471a6c76f7c025f15335dc28df561b150e9d146772ac
font_01_sfnt_off00010c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6B 10896 bytes
SHA-256: 6f87516dbb964c9f0bf1291a7b3e85962fef25da960e374a8afeee059c0d5c81
font_02_sfnt_off000125c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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