PDF malware analysis — malicious · 53414840d924cee1

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 05:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 38c9433e9956dd11b17790c19c1ba9d9 SHA-1: 6877509f49f1470de89aa2321cad71e0b8c1a039 SHA-256: 53414840d924cee180a97b451f416e5cc7b9c765123aeec092e869bc7d7b4a06

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and contains numerous external URIs and link farm heuristics. The PDF document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links. The presence of multiple compromised CMS upload links and disposable hosting further indicates a malicious intent to redirect users to potentially harmful sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=movie+apps+android PDF link annotation
- https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16130ee4360da3---nuzenazopizajizawid.pdfIn PDF document text
- http://samocvet.org/foto/ck/files/43936452889.pdfIn PDF document text
- https://extremedriveline.com/ckfinder/userfiles/files/75426299111.pdfIn PDF document text
- https://moyaexpresss.com/ckfinder/userfiles/files/megutiz.pdfIn PDF document text
- https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16143e8d556143---61965926416.pdfIn PDF document text
- https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/21754182938.pdfIn PDF document text
- http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/loqnsksj86vvkea6drhiukaqvj/59236877844.pdfIn PDF document text
- http://akcjonariusz.com/UserFiles/file/71415404580.pdfIn PDF document text
- http://networkinglikepro.com/ckfinder/userfiles/files/52012221914.pdfIn PDF document text
- https://gtijsr.com/userfiles/file/kanubagogukurozotolo.pdfIn PDF document text
- http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/10813411790.pdfIn PDF document text
- http://vietkinggroup.com/uploads/userfiles/file/12972790703.pdfIn PDF document text
- http://bakefruit.com/uploads/files/202109151449461231.pdfIn PDF document text
- https://aldurra.ly/images-editeur/img/file/vefifovupakazikomizegara.pdfIn PDF document text
- http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e71730d3f---45874374806.pdfIn PDF document text
- https://livres-arts.com/ckfinder/userfiles/files/45522583366.pdfIn PDF document text
- http://asqcert.net/files/files/sorizepaf.pdfIn PDF document text
- http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/14161648570.pdfIn PDF document text
- https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/jifadumuguvewijizo.pdfIn PDF document text
- https://www.aillant-sur-tholon.com/ckfinder/userfiles/files/wedanoxanotoresewu.pdfIn PDF document text
- http://seamcc.com/UserFiles/files/75172097956.pdfIn PDF document text
- https://episcopiaoradiei.ro/files/xiwilinedaxewe.pdfIn PDF document text
- https://dagvandearchitectuur.be/_files/file/16575523084.pdfIn PDF document text
- http://szerecsen.hu/editor_up/sixitegowanamaman.pdfIn PDF document text
- http://bagodilovaspark.hu/userfiles/file/48824107580.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_off0000dccd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDCCD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f4df.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF4DF	17992 bytes
SHA-256: `958a3d08cb2922644873d54df6b9a5482fc69302bdbd6ee7eb575d7c4ab8c525`
`font_02_sfnt_off00012397.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12397	10300 bytes
SHA-256: `17879b341786caf446761c5e4d04ba1d9c1f4aa7f4c51d2e81f53839741cdf8e`

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