PDF malware analysis — malicious · 27485f320c03e429

MALICIOUS

PDF

89.7 KB Created: 2021-06-29 03:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: fba19a9719ac76e82f734ce67321bdcb SHA-1: ce42425767ee32a6f5b8963c13ea595c547f66a4 SHA-256: 27485f320c03e4299aef9d65cb4d28532e7def2b78a72604d2ac2b6ccb6fb44b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The presence of external URI heuristics and link farm indicators suggests the primary function is to redirect users to malicious content hosted elsewhere.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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 http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083bfcacc763---82779537855.pdf In PDF document text
- http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d72cecb41ee---xojokolela.pdfIn PDF document text
- http://a-swiss.com/upload/userfiles/file/93316075704.pdfIn PDF document text
- http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/12068phph1v2ildfd2rhuk2hv3/52599916230.pdfIn PDF document text
- https://abicecream.ru/ckfinder/userfiles/files/10598537107.pdfIn PDF document text
- https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/ecced6a2d2ca0007feb2b6bb5e59f83c/mozomagerolewubewovewo.pdfIn PDF document text
- https://leosservices.com/userfiles/file/defuzawuvijifejemiguro.pdfIn PDF document text
- https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/e45541f1ed8bc542ceec5d50674522f3/jiganosuket.pdfIn PDF document text
- http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c31431fdd---7758827364.pdfIn PDF document text
- http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/7jqv4rqree7d5fu6e06g3dlfq5/39546069230.pdfIn PDF document text
- http://nawooelcs.com/upload/userfiles/2021/06/files/210617213116.pdfIn PDF document text
- https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/vn1lh5gqav217r4gelqmqjc7ss/442627049.pdfIn PDF document text
- https://kltccompany.com/ckfinder/userfiles/files/zafijaxufi.pdfIn PDF document text
- https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/pemodajijevurixezezu.pdfIn PDF document text
- http://koreaseowon.com/ckupload/files/koxonade.pdfIn PDF document text
- https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/c6665c35cd7559870128ce37c79626aa/wajon.pdfIn PDF document text
- http://jarauwerdaenzn.nl/userfiles/file/22518775600.pdfIn PDF document text
- http://healingtown.org/userData/board/file/76604950606.pdfIn PDF document text
- http://airsoft1.ro/files/file/12681570842.pdfIn PDF document text
- http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4f5bba0a5---90917945998.pdfIn PDF document text
- https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c31a93741ef---junutaziwi.pdfIn PDF document text
- http://naturallabs.de/userfiles/file/3476272151.pdfIn PDF document text
- http://driver-jazda.pl/upload/file/nezax.pdfIn PDF document text
- https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/9eb8e83287bc8a762dcf43328140fb8e/37050326600.pdfIn PDF document text
- http://campingwithconvenience.com/files/files/mojofirewiz.pdfIn PDF document text
- https://avphunter.ro/ckfinder/userfiles/files/51847879255.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=constant+velocity+joint+pdfPDF 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_off0000fa45.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA45	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00011257.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11257	17612 bytes
SHA-256: `89cbf8f6a163074f6edc4861fcee4e9d5f56b6dcb99570e564274d5f1c0be38c`
`font_02_sfnt_off00013f9a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13F9A	10856 bytes
SHA-256: `c94f18a9cc5feb7f478753c0b197611cc2953503d52b6243b24d07bbea2b662b`

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