PDF malware analysis — malicious · a3f18bede5264b25

MALICIOUS

PDF

89.5 KB Created: 2021-08-06 11:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: ca55f3f083866242fa06dd0a6acea53d SHA-1: 4849402d7bc860618452badf1c833712040f11db SHA-256: a3f18bede5264b25663c1a9fb393bdea7f5c6aefc9f492ab502218f08f10da32

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS upload directories or disposable hosting. These links form a link farm, a common technique used to obscure the final malicious destination, likely a phishing page or malware download. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9985

Heuristics 7

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://crewmak.ru/uplcv?utm_term=adjetivos+posesivos+en+frances+pdf PDF link annotation
- http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/47399206681.pdfIn PDF document text
- https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/744c6456da76980f1348c09dd8a599f2/gokogovedukatevatetux.pdfIn PDF document text
- http://tamker.hu/userfiles/file/28009722399.pdfIn PDF document text
- https://ahha.az/userfiles/file/tagajunogozisomerinadol.pdfIn PDF document text
- https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d22895a9759---47422296245.pdfIn PDF document text
- https://hainutedecopii.eu/ckfinder/userfiles/files/letebupipapif.pdfIn PDF document text
- https://hinodanang.com/uploads/image/files/vutamogifazaj.pdfIn PDF document text
- http://dynamic1984.com/user_file/file/85825819475.pdfIn PDF document text
- http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c64a1ec01---33936905312.pdfIn PDF document text
- https://4appsoftware.it/file/gijebemin.pdfIn PDF document text
- http://deauville.ru/files/file/72945476950.pdfIn PDF document text
- http://runo34.ru/attachments/file/6753279093.pdfIn PDF document text
- https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/2fe0f0d795f0d27518da372021e2b2f1/puxigonenanuvemodixijo.pdfIn PDF document text
- https://hkbca.org/UploadFiles/file/20210625200638160.pdfIn PDF document text
- https://aarhuskortet.dk/images/file/79677644674.pdfIn PDF document text
- http://www.kickcommerce.com/userfiles/file/gobataderulizumipigime.pdfIn PDF document text
- http://remaining-mc.de/userfiles/file/verilipulopeperazegara.pdfIn PDF document text
- http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080252de3fb9---mideremiwasuzikuf.pdfIn PDF document text
- https://maychieuvinh.vn/upload/files/92929205262.pdfIn PDF document text
- https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/db6qqfub1lak5phiganb9ors3k/serokazo.pdfIn PDF document text
- https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160976c853df9c---2725444323.pdfIn PDF document text
- http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a034c2150cc---9960246741.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_off0000f2f2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF2F2	19856 bytes
SHA-256: `b0b3d48c46b2543b9fe2bd234ed910e10148c9ce9011da453c3c6028d8241a4b`
`font_01_sfnt_off00012495.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12495	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013cac.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13CAC	10744 bytes
SHA-256: `86e2621d9f0b9d02f4094fa9fb2f237b2f95bb62233dbc413d27500494f99d30`

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