PDF malware analysis — malicious · 9287a39b4f359862

MALICIOUS

PDF

81.1 KB Created: 2021-09-06 08:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: 85fee5b3d8708a30d96bac32f80acef3 SHA-1: 51f68275abe619cbec05473a07fb00d01d9f2e54 SHA-256: 9287a39b4f359862f3e3fa06cd38705e4e21cd959642e2851fbdbe045d9b8217

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting it functions as a link farm to distribute phishing or malware payloads. The presence of embedded URLs and the nature of the heuristic firings strongly suggest it is used in a spearphishing campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

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://krisoc.ru/uplcv?utm_term=operational+excellence+handbook+pdf PDF link annotation
- https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/e7c3ce8cb8c8b98869a409183612e92a/5471829066.pdfIn PDF document text
- https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/ed9a42ee9d02aa4e4b9943ed54bdc3e0/zogixobadupop.pdfIn PDF document text
- http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cca475b9d---xufefivunufexorafejedib.pdfIn PDF document text
- https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/50792391860.pdfIn PDF document text
- https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/154a68430ec523ea76a6e1416e28fd99/wamezefujaroriv.pdfIn PDF document text
- http://el-master.ru/userfiles/file/7168304175.pdfIn PDF document text
- http://goraku-sangyo.com/userfiles/file/sezine.pdfIn PDF document text
- http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607377c9ae945---64229893354.pdfIn PDF document text
- https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16081e7056584b---togus.pdfIn PDF document text
- http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16072f49cbacd5---81973482066.pdfIn PDF document text
- http://sjar-tech.com/uploadfile/file///2021051816215047.pdfIn PDF document text
- http://locnuocvietmy.com/Images_upload/files/91228779042.pdfIn PDF document text
- https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/443019684e84b3f9c2176ec9ee6746ef/11671837935.pdfIn PDF document text
- https://kudamatsu.org/userfiles/file/monegif.pdfIn PDF document text
- https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160837f01c9bc0---buboxusukusujegupulukebek.pdfIn PDF document text
- https://ryokanclub.com/FileData/ckfinder/files/20210703_E6EBCC20F1AEA42B.pdfIn PDF document text
- https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/s4tpa28kmu4p5ed9b2rqigmlf8/bodituwuzukiperipiwo.pdfIn PDF document text
- http://worthingtonpark101.com/userimages/nefederutipiso.pdfIn PDF document text
- https://stpeterscbs.ca/ckfinder/userfiles/files/dalofimemikomejipefaxu.pdfIn PDF document text
- http://factorycontrolprojects.com/userfiles/file/77889166562.pdfIn PDF document text
- http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720e9838da7---3596802744.pdfIn PDF document text
- http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16073c05f0335e---42101057514.pdfIn PDF document text
- https://get-insurance.in/ckfinder/userfiles/files/mulixipadagemovitegavuk.pdfIn PDF document text
- https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/81ba5fe7dec939d81d65c594079410ec/veposavulafuvep.pdfIn PDF document text
- http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kuludosojerumezidodudem.pdfIn PDF document text
- http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607005d04d4f0---vipoxunakuturiruduguso.pdfIn PDF document text
- 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_off0000d866.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD866	17352 bytes
SHA-256: `85c41c3a2201dbe50b25125c2f63129a0465d5ff9a19ea66f7db3cfc1989111e`
`font_01_sfnt_off00010549.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10549	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011d60.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11D60	10908 bytes
SHA-256: `a6ef5292b94647cf2ff7a3a825eac4a44c4ddac8f3575cac2b4ef29a91e6e755`

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