PDF malware analysis — malicious · b6c50370bbb90354

MALICIOUS

PDF

75.3 KB Created: 2021-05-09 23:35:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11

MD5: 4e9440b491825cfd25967b6863206678 SHA-1: be88b63cf2071a5e762cb83adf578416775a0681 SHA-256: b6c50370bbb9035496c0adbc1bb72d264fbd4b9bc78de86c564f6eb5176ca428

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to lead users to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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://queure.ru/uplcv?utm_term=sinhala+nursery+rhymes+song PDF link annotation
- http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608d557868839---11750028180.pdfIn PDF document text
- http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160774ef3a23eb---76220837401.pdfIn PDF document text
- https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb6bd7efa3---bogibafej.pdfIn PDF document text
- http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecd501c35d---11796601660.pdfIn PDF document text
- https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763d7c9e650---jafokotimavatuwuxogixoru.pdfIn PDF document text
- https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/5e33847542e3f08eead20c1170d5396d/ketebimogutawozafuro.pdfIn PDF document text
- https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/9iuubc0e2td15vktejemnaqu64/4764680048.pdfIn PDF document text
- http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608067d4ea5cf---witujepupuwukemarugeko.pdfIn PDF document text
- http://apexhealthnutrition.com/newerac2c/userfiles/file/95241280530.pdfIn PDF document text
- https://atraba-holding.com/userfiles/file/4226164326.pdfIn PDF document text
- http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16087c655e589c---gazolujuledujemijuzen.pdfIn PDF document text
- http://anthonyvienna.com/sites/default/files/file/54793593729.pdfIn PDF document text
- http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608828629008b---812445617.pdfIn PDF document text
- https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/03ea5f5c11f1a004b47ccc7576c33eeb/2340997134.pdfIn PDF document text
- https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/2e7637cc563c6d8d444623b8424a7e9f/30533427083.pdfIn PDF document text
- https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/f1b364b47025faef8286b7df11c97c16/3728147864.pdfIn PDF document text
- https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/1fbdaeee7ee63ea693e01ac38c17e738/44138335050.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000dcad.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDCAD	5108 bytes
SHA-256: `1aca5028a41ec44329067d189e27a9b9db3045ca8a663c2780c47cbb284c1c1c`
`font_01_sfnt_off0000edcb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEDCB	10752 bytes
SHA-256: `6af1c2c00b13f6d089642a30e66ce9022c42d6e8205bfef0442c9d47fbebfc6e`
`font_02_sfnt_off0001124d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1124D	4324 bytes
SHA-256: `ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3`

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