PDF malware analysis — malicious · 5f8fb61ebe362071

MALICIOUS

PDF

79.3 KB Created: 2021-09-05 06:32:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: dcadf7dd6eb23db7368339155230a675 SHA-1: 89916fedf35269907cce20c5b8f1ac977bbee75a SHA-256: 5f8fb61ebe362071ef2fb239a5466f3491a946f6e51b23c07b5e55dce9c59e43

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to compromised CMS upload storage, suggesting an attempt to host malicious content or redirect users to phishing sites. While no scripts were explicitly extracted, the nature of the URLs and the detection indicate a likely attempt to exploit users through malicious links, potentially leading to further payload delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9949

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://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16090fcb5893e0---78394502848.pdf In PDF document text
- https://shopexpert.com/app/webroot/files/userfiles/files/9708042378.pdfIn PDF document text
- https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/6e424b0e54189e03de3ac70378a0b138/63129848974.pdfIn PDF document text
- http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fa542ad045---11169447858.pdfIn PDF document text
- https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609738811a758---pefoter.pdfIn PDF document text
- https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/6c68181838da21d2590c579d32f4a807/mibakiri.pdfIn PDF document text
- http://coinmarketsuite.com/ckfinder/userfiles/files/kowipifesesuvewotekenoki.pdfIn PDF document text
- http://studiotecnicopetrillo.eu/userfiles/files/wurabinolupumola.pdfIn PDF document text
- https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/f0240db8bb65f3a583d1f2669d5b9250/16699408079.pdfIn PDF document text
- https://airshow-bg.com/file/80088463657.pdfIn PDF document text
- https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/73d23fc6dcc95512f951e580290ef9d0/vudubivawawisokunaru.pdfIn PDF document text
- http://csc-020.com/userfiles/file/20210618210314_2ldogz.pdfIn PDF document text
- http://websteravelandscaping.com/editorData/file/batulugilekibarop.pdfIn PDF document text
- http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fe8d5dd5f---taxogefuxitixibun.pdfIn PDF document text
- http://kondicionery-shodnya.ru/upload_picture/file/14946521053.pdfIn PDF document text
- http://smepil.com/ckeditor/userfiles/files/5636181642.pdfIn PDF document text
- http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kumoz.pdfIn PDF document text
- http://www.logomarcanet.com/userfiles/file/72778868030.pdfIn PDF document text
- https://homestayhoian.vn/uploads/image/files/36434386063.pdfIn PDF document text
- http://muzeumostrowiec.pl/obrazy/file/94393749848.pdfIn PDF document text
- https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0b386d1984---topanijexiked.pdfIn PDF document text
- https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e17d6ac7f8d---binudamizetofowizu.pdfIn PDF document text
- https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fc4817ee2---68631724671.pdfIn PDF document text
- http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160beea2d4cf68---8056790353.pdfIn PDF document text
- http://circuitoinsulargc.com/documentos/file/21002950356.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=tabla+periodica+hd+4k+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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000cb3a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCB3A	19572 bytes
SHA-256: `23ba4901e079958f2178d657a968847bd73dbc012f71e965c2d7fe5ad54256a5`
`font_01_sfnt_off0000fe4f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFE4F	10620 bytes
SHA-256: `46ab36dd7e44539458bfada9ba0f86619777f28bae6d99c7ca236491b183edf7`
`font_02_sfnt_off0001167a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1167A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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