PDF malware analysis — malicious · f393e09d29e6dbf6

MALICIOUS

PDF

73.8 KB Created: 2021-09-19 02:07:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 80258a876fe97441974a9caf73715228 SHA-1: f6b20f3c0257a10ceaf9887c95b3a7c7bbdd0f24 SHA-256: f393e09d29e6dbf699abd4d81efb0039d7e1b0c6c9f99eb401f6edd7c934d49c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs that form a link farm, directing users to potentially compromised websites. Heuristics indicate these links are used for SEO manipulation and point to disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://archism.ru/uplcv?utm_term=best+pdf+for+pc PDF link annotation
- https://asztromiskolc.hu/ckfinder/userfiles/files/tadofemov.pdfIn PDF document text
- https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/netewelivabek.pdfIn PDF document text
- http://thesecurityguardunion.ca/userfiles/files/sikaka.pdfIn PDF document text
- http://marcobernini.it/userfiles/files/xorolofunonaxal.pdfIn PDF document text
- http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79338965495.pdfIn PDF document text
- http://synagoge-stommeln.de/ckfinder/userfiles/files/88609630259.pdfIn PDF document text
- http://iburgisidimarsala.eu/userfiles/files/574561988.pdfIn PDF document text
- http://solis.altrodesign.eu/ckfinder/userfiles/files/53749600776.pdfIn PDF document text
- https://arabadvertise.com/userfiles/files/jurupizaniterowujakabez.pdfIn PDF document text
- http://anapro.com/ckfinder/userfiles/files/lasipoxirupisa.pdfIn PDF document text
- https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144c9bcd7625---59902290207.pdfIn PDF document text
- http://izmirtavla.com/upload/file/97219552358.pdfIn PDF document text
- http://inlovehuahin.com/file_media/file_image/file/69909984784.pdfIn PDF document text
- https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/d44c76fa0e6dd198c61f97b31651a2cd/sexokasabon.pdfIn PDF document text
- https://podgoricki-klub.me/userfiles/file/72244230240.pdfIn PDF document text
- https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/30754925302.pdfIn PDF document text
- https://kildevangen.dk/files/34088499227.pdfIn PDF document text
- http://devitohomesorlando.com/userfiles/files/97546367328.pdfIn PDF document text
- https://hogozaty.com/ckfinder/userfiles/files/zematepijunadedikogejut.pdfIn PDF document text
- http://acrclubinversores.com/files/galeria/files/50443533912.pdfIn PDF document text
- https://redengewinnt.com/userfiles/file/33345362072.pdfIn PDF document text
- http://pcserviszlin.cz/ckfinder/userfiles/files/2948703855.pdfIn PDF document text
- http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xovuzafutazuvavunepuzaki.pdfIn PDF document text
- https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6943554de---kezebufubiguzor.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_off0000be0d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBE0D	17112 bytes
SHA-256: `7bbf69e97871178261b467d55cc12e2bba9c2aa9827895e2fa4481c6f8478815`
`font_01_sfnt_off0000ea80.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA80	10264 bytes
SHA-256: `3e7038f6c48c667803d84a9a05fe163b06a59f6bc2f3e74e0a496eb203d17822`
`font_02_sfnt_off000101bc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x101BC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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