PDF malware analysis — malicious · da4cf0649fe1f649

MALICIOUS

PDF

83.7 KB Created: 2021-09-07 14:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 9ec24bff63c161e4f17b6c3e14eef4f8 SHA-1: f80ffc97eaffdf29f41bcbff3dabf641b3542e39 SHA-256: da4cf0649fe1f6499993d5240e8dcdb872f9cb7f1b894f07750a51907e8be7d3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external PDFs hosted on compromised websites, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, pointing to a link farm strategy on potentially compromised infrastructure.

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://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b745cd68020---xevoginunowow.pdf In PDF document text
- http://creptiles.dk/userfiles/file/dabiwiregimazolete.pdfIn PDF document text
- https://botroul.be/uploads/rulopitugir.pdfIn PDF document text
- http://barcabianca.eu/upload/file/2373064762.pdfIn PDF document text
- https://garnet-medical.com/userfiles/files/xejivozojixe.pdfIn PDF document text
- https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ef1ade178---3099716516.pdfIn PDF document text
- http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c05b8024ffa---43499319540.pdfIn PDF document text
- https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/c687e116b2845dcbb0a3fe322ac6ce5c/49009788342.pdfIn PDF document text
- http://annamsaigonlaw.com/upload/files/vipakami.pdfIn PDF document text
- https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/ks13o078ad9gtaol22uv39ood1/95158308296.pdfIn PDF document text
- https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/c064ae106842c4470ecff428506954aa/lolujure.pdfIn PDF document text
- http://facilitymanagementassociates.com/survey/userfiles/files/25367343550.pdfIn PDF document text
- http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16086fecace4bd---41018402038.pdfIn PDF document text
- https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/7d6437e00911ac31a4dbfdc45a7218ee/39595439235.pdfIn PDF document text
- https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f03069101b---81036473391.pdfIn PDF document text
- http://gazduire-domeniu.com/UserFiles/file/nazipedutifetozi.pdfIn PDF document text
- https://tort-art.ru/userfiles/file/41900884653.pdfIn PDF document text
- https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f8d40314f---xanurowadigusogezuxobozi.pdfIn PDF document text
- https://smartstone.ca/userfiles/files/pepogujomenulunanir.pdfIn PDF document text
- http://tuttotop.com/userfiles/files/dijugetegege.pdfIn PDF document text
- http://www.maderas-navarro.com/ckfinder/userfiles/files/32997547669.pdfIn PDF document text
- http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160efd4ca86c9b---22290854594.pdfIn PDF document text
- https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/ef4d64f4654d60cb6d8f1cd580f4599c/45169023394.pdfIn PDF document text
- https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160973b67ebce6---36446370730.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=telugu+calendar+2019+january+pdfPDF link annotation
- http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608474db4ae73---defebipebewowunofozas.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_off0000e165.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE165	11088 bytes
SHA-256: `2c5baf14b7f3c179873fbb1f5c0382054109589662fcbbd57c591278b514a9f7`
`font_01_sfnt_off0000fb51.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB51	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011363.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11363	17500 bytes
SHA-256: `7b9152a9ee901c3945ef5d9206c9202ac1920dae81ce0d488e4ae2930ea1acfa`

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