PDF malware analysis — malicious · a50fe767bc1a5c4e

MALICIOUS

PDF

73.7 KB Created: 2021-09-05 05:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 5a90a0bbc5fc52a51f9310a0f8c78fc9 SHA-1: 9ceaf15167e6ab6eaedd11c04dbe5e4972eb0384 SHA-256: a50fe767bc1a5c4e9e6369dfeafe16d2fb25a28315c05823b0fb368db632fa34

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal a link farm structure pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs likely serve as lures to external malicious sites, potentially for credential harvesting or second-stage payload delivery.

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://coretry.ru/uplcv?utm_term=learning+styles+inventory+middle+school+pdf PDF link annotation
- https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9e6c8eb33---71687658511.pdfIn PDF document text
- http://salon-urody-bellis.pl/images/file/53302948281.pdfIn PDF document text
- http://senseoftourism.dk/userfiles/file/57651120369.pdfIn PDF document text
- https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af943b53346---zudedarozanozomowepojod.pdfIn PDF document text
- http://xinyaoqiye.com/upload_fck/file/2021-8-10/20210810170410353519.pdfIn PDF document text
- https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/r0vb35psukpr3kvseqoe15u28u/64052299673.pdfIn PDF document text
- https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b06eda8eb0---4937763586.pdfIn PDF document text
- http://metrokentakifinan.com/resimler/files/99346304285.pdfIn PDF document text
- http://fnathservices.com/upload/file/39631573160.pdfIn PDF document text
- https://blindnow.com/userfiles/file/9356277042.pdfIn PDF document text
- https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/v3fqkmdhgmkbiilh7052dhb8ed/33175629141.pdfIn PDF document text
- https://dycmc.com/DATA/upload/files/202108141850499580.pdfIn PDF document text
- https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160abbc031f462---zorakof.pdfIn PDF document text
- http://kimwendelldesign.com/ckfinder/userfiles/files/xegunavamitatefiwevi.pdfIn PDF document text
- https://ctners.com/ckfinder/userfiles/files/57872382311.pdfIn PDF document text
- http://cleanking.net/userData/board/file/noruvewuzotemofuvejekugad.pdfIn PDF document text
- https://waroproject.com/file/goxosapezo.pdfIn PDF document text
- http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1611e9cc3d0fec---worubuzilizojoledurinovax.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082358064140---lanuxofuvetuloxisazu.pdfIn PDF document text
- https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/20b779e4fe8e1cc1b7e39c570b3e9d70/wumojonadag.pdfIn PDF document text
- https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/58mpv5scbk5mfrlmo465lc3fn6/46199712200.pdfIn PDF document text
- http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16095fe322a649---72235144241.pdfIn PDF document text
- https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160804bae19fdd---xivubagodexalolitididud.pdfIn PDF document text
- http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f05c6ee0a---48239341241.pdfIn PDF document text
- https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/13b56de61e7a5c7491038ab39ce4958b/97315944132.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_off0000bec2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBEC2	11204 bytes
SHA-256: `e5c820ea87880dd5667fa860a8613a90054674841a118010b007dc0ca485bae5`
`font_01_sfnt_off0000d897.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD897	15708 bytes
SHA-256: `8087837c0e8f79c4ffa69185b3fe7dc0b9a22ce569deeb801c571f1a084a6d5a`
`font_02_sfnt_off000100a9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x100A9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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