PDF malware analysis — malicious · cd2bb8c2e43ae650

MALICIOUS

PDF

99.7 KB Created: 2021-07-15 11:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 7a4488beeaeca0dbfe7c87b1fd20ab62 SHA-1: 510a6c4f86f7e00c896c35596f103f70aae52d12 SHA-256: cd2bb8c2e43ae6502150ec9a9cc997b5e0f964d73f6016b1e3ec27b82b7c16d6

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The numerous external URLs, many hosted on suspicious domains, are the primary indicators of compromise.

Machine Learning

Nyx PDF Classifier malicious score 0.9800

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://gmei.lt/ckfinder/userfiles/files/borup.pdf In PDF document text
- https://toocapen.com/files/puretisezekuwujusijada.pdfIn PDF document text
- https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/09b3d44a71509b55dfb9ab7fbed6430d/98250397517.pdfIn PDF document text
- http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a484c3911eb---76776551365.pdfIn PDF document text
- http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adfafd2a101---44947988847.pdfIn PDF document text
- https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/bbf54710c238f60d979deccbe5136c04/dijewikupimubaku.pdfIn PDF document text
- http://hoanggiaphatstone.com/upload/files/95281296493.pdfIn PDF document text
- http://kamerton.nl/clientfiles/jipowatafavatinas.pdfIn PDF document text
- https://leavereview.com/customerinterview/ckfinder/userfiles/files/jimevujuzonoguxamexoxa.pdfIn PDF document text
- http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609afcc689cef---7491702861.pdfIn PDF document text
- http://sys-svinding.dk/userfiles/file/bapularog.pdfIn PDF document text
- http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/66a82545a7d215e06fd8aee93a59b2df/zaxojapixilogaxor.pdfIn PDF document text
- https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/30d527cf152713860378739c50d4c909/1475947666.pdfIn PDF document text
- http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c64114c001---71119579928.pdfIn PDF document text
- http://abbuffalowings.com/uploads/files/fadifupewinebe.pdfIn PDF document text
- https://gym-rectif.fr/ckfinder/userfiles/files/watezibixotux.pdfIn PDF document text
- https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/02158514911255fb60869fc534e618ca/87867090281.pdfIn PDF document text
- http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gitutoviboxuzewal.pdfIn PDF document text
- https://cometsecurity.in/admin/userfiles/file/dodos.pdfIn PDF document text
- http://vom-ragnaroek.de/uploads/file/87812017002.pdfIn PDF document text
- https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/b56127eebf64be20f3eb9289c762dbf0/3014243782.pdfIn PDF document text
- https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/9e3f609901kqakk0btslu3eenr/40289734320.pdfIn PDF document text
- http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c55fc8814a---kowiboruv.pdfIn PDF document text
- https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/26507ad3fc0c5eee02707645ad9e08c4/58670521728.pdfIn PDF document text
- http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160775791d0ed0---62241500318.pdfIn PDF document text
- http://birnagarcollege.in/userfiles/file/23455023703.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=the+cobble+storePDF 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.

Filename	Kind	Source	Size
`font_00_sfnt_off000121d5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x121D5	18388 bytes
SHA-256: `15d45a501e38739dec41d3f3c24c82d9e174d97bf75974ba568b9d969f7549ac`
`font_01_sfnt_off000152f8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x152F8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00016b0f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x16B0F	10072 bytes
SHA-256: `ab7a117e84b744d9dde0926070da8409d392329b17b399f6b86215854f3246c7`

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