PDF malware analysis — malicious · bda054f4571098cc

MALICIOUS

PDF

79.4 KB Created: 2021-08-01 12:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: c313ec08fe29e70aaac8e2b3a1aadd39 SHA-1: 1f2f9957b5861df5f3f87a748dbb1c65cca03d98 SHA-256: bda054f4571098cc926c2ac03957c7b30df280c9852d6e23e0fbbc6de2116f4d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it is part of a link farm designed to redirect users to malicious sites. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, indicates potential for further malicious actions like downloading second-stage payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9978

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://archism.ru/uplcv?utm_term=the+process+of+parenting+9th+edition PDF link annotation
- https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095188200aa6---77044535804.pdfIn PDF document text
- https://ajitcoatings.com/uploads/47988821655.pdfIn PDF document text
- http://ccforum.kr/uploads/file/1623508358.pdfIn PDF document text
- https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/e564aeb8e36a6b6512e3fed7425ea9dd/sawonavogivener.pdfIn PDF document text
- https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/4cc4fe4e4ebb92d0e7dcc78a016e0f3a/80854133049.pdfIn PDF document text
- https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/in6lg5spmofouh80r281i00ngt/35901032126.pdfIn PDF document text
- https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/048cc938b47b1cb48d3c4c591aa8b3aa/buxotizedoxabigugexo.pdfIn PDF document text
- https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/3efe5285729b04c0cef7236a3b833d15/51652485413.pdfIn PDF document text
- https://kisikana.hr/userfiles/file/1952428832.pdfIn PDF document text
- http://chipmax.in/chipmax/ckfinder/userfiles/files/rasozawiwifujegufowelabu.pdfIn PDF document text
- https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/9ff7a1df18b4d5ab3e519cb458be940c/kemipokizajedonijabo.pdfIn PDF document text
- https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607504035cc76---50919943929.pdfIn PDF document text
- http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160fa94cee6ac7---xikobuwojavemuzep.pdfIn PDF document text
- http://alliance-ic.ru/uploads/file/gizemedijemokegaten.pdfIn PDF document text
- http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608234b121d59---vulewelegimeparaxilonevi.pdfIn PDF document text
- https://dondepodemosir.com/userfiles/file/20152790895.pdfIn PDF document text
- http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/1c5e669eaa1ac3568a09e203330910f4/vovolajodejuto.pdfIn PDF document text
- https://aspaeng.com/files/image/files/zosakedudepumidufufe.pdfIn PDF document text
- http://ohstigers66.com/clients/d/da/da15611725e7ba20b6827cbf2e24f87d/File/kuwafumukoxe.pdfIn PDF document text
- https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ecdd00ae0---7339726430.pdfIn PDF document text
- http://dekoblickfang.de/userfiles/file/mifasit.pdfIn PDF document text
- http://renovator.cz/files/file/kugaxuziru.pdfIn PDF document text
- http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/fuvigul.pdfIn PDF document text
- http://s292376414.onlinehome.fr/datas/imgmail/file/29400225103.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_off0000d249.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD249	16488 bytes
SHA-256: `4f48d6a6f0fe3af48fb29d95d934588cdca90492079235b3b92ce5277f3d4c1a`
`font_01_sfnt_off0000fd46.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD46	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001155d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1155D	10984 bytes
SHA-256: `e87f7767d54b15cc4c83aa78c33c17ebe8bf5c0586db2e55901ed593dcc2605c`

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