PDF malware analysis — malicious · bdd8c83649e914af

MALICIOUS

PDF

86.8 KB Created: 2021-07-07 10:04:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: e6fb1dfedde87d1723146fce9bdf0d63 SHA-1: ff47f2e2c99baef25915e3e2d429af9d42bd0e62 SHA-256: bdd8c83649e914afc700bfd2152408c5054ae0eaa3c3a11f6c81da7444d7664c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories. These links likely lead to further malicious content or phishing pages, indicating a multi-stage attack. The presence of multiple distinct hosts and the use of disposable hosting suggest an effort to evade detection.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/rbu24o079l6sm3710mektncm09/52880109771.pdf In PDF document text
- https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/21ba349ac5da32d879021e6a84af9471/42719312850.pdfIn PDF document text
- https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091b9fb3f47b---sumitilaso.pdfIn PDF document text
- http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf536a4c4e---jasekik.pdfIn PDF document text
- https://an-professional.ru/img/files/file/lopasapopuloraxevexomipo.pdfIn PDF document text
- http://baovephuongtroi.com/vietkiendo/upload/file/47351593722.pdfIn PDF document text
- http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160755c42cc7de---12475168306.pdfIn PDF document text
- http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607094c81902d---99391589996.pdfIn PDF document text
- http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160b0778a3d94b---25981991513.pdfIn PDF document text
- http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc1da2d7b7---lesogotejufugoxiwaguxij.pdfIn PDF document text
- https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/e519b7541e59dfc1351df20805c84997/45081594537.pdfIn PDF document text
- http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/mkiatpc298h713n726p22ode5h/mimofamapagirunodubo.pdfIn PDF document text
- http://popnmusic.fr/userfiles/file/40556598695.pdfIn PDF document text
- http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160e467778e7e0---foxekuliditobakapovoxuk.pdfIn PDF document text
- http://uctodane.cz/UserFiles/File/67020850016.pdfIn PDF document text
- http://yorktownhs1987.com/clients/57482/File/42760976550.pdfIn PDF document text
- https://circolodelpistone.ch/userfiles/file/8333202258.pdfIn PDF document text
- http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1cb0b667b---dapokibebufokuno.pdfIn PDF document text
- http://cukrarnakolbaba.eu/obrazky/files/55473844309.pdfIn PDF document text
- https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/03cb2de088873d0dc73b4d6465ceb406/17724930179.pdfIn PDF document text
- https://ocbond.org/userfiles/files/83443826761.pdfIn PDF document text
- http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ad96c9be249---tirujoxon.pdfIn PDF document text
- https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/crm116ts5tg6nbgmsje83l77m2/2144149186.pdfIn PDF document text
- http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756c1d84214---dawonigilipavu.pdfIn PDF document text
- https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa60c42417f---89351940405.pdfIn PDF document text
- https://securityguardsupply.org/php/uploads/file/95830505797.pdfIn PDF document text
- https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/ackunvh36rmu8n16kkmhfm9pqp/wojakarodotekeriwazidimon.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=rice+water+for+hairlinePDF 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_off0000ef32.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF32	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010749.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10749	10396 bytes
SHA-256: `1f52dfccbad70f8fa05032f95848a136be5dd3617677e119ac0004f1c910df5e`
`font_02_sfnt_off00011ec8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11EC8	17644 bytes
SHA-256: `10cf6cfb5eff21214980b5c992cf54e4f125427fe6e6e032d2d52d9af4134319`

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