PDF malware analysis — malicious · bff25137dbedc2ea

MALICIOUS

PDF

87.2 KB Created: 2021-07-14 07:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 5b44fb60923401e8c98cebd7cdac2c7f SHA-1: c273c49e5928ecac936b7f84af1ad5313acfa715 SHA-256: bff25137dbedc2ea5a364bb413a054ea046dd0e3cd9b529877a4276dbed57a6a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external URIs and links pointing to compromised WordPress sites, suggesting it functions as a link farm to redirect users to malicious content. The presence of embedded URLs and the nature of the links indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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://archism.ru/uplcv?utm_term=definition+of+necrotizing PDF link annotation
- http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f9d65329f---67604874928.pdfIn PDF document text
- https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/d1ae5b0ad40c22da462ba0e5a4c6255f/70702434937.pdfIn PDF document text
- https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/f45afc996674eb3bb0f017616f0199f8/xisole.pdfIn PDF document text
- http://chrislahoda.ca/userfiles/file/sidawarikumovuregapanupu.pdfIn PDF document text
- https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/ng36o5bas2ervu7efdjdh4ueud/79285457127.pdfIn PDF document text
- http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0f483cc73---12551402367.pdfIn PDF document text
- https://steammining.com/userfiles/file/levozimebegubaduxupug.pdfIn PDF document text
- https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/3d540b1fa7087908c5553b3b5944eac0/52657851266.pdfIn PDF document text
- https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/2eff31d560778056d654ed717ca525ff/desawuladelomodevipobidu.pdfIn PDF document text
- https://vnsteeldetailing.com/UserFiles/files/87251413565.pdfIn PDF document text
- http://obasekiestates.com/UserFiles/file/59397031222.pdfIn PDF document text
- http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa07ee9cbc---31252555956.pdfIn PDF document text
- https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/hutdbl3bpab8vbu6f5t1kjq75j/99415665002.pdfIn PDF document text
- https://agatanorek.com/files/file/tivaratuvikurizetikej.pdfIn PDF document text
- https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607e19412b5a1---vuwudisalexunowe.pdfIn PDF document text
- https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3d4f6d6a1---6777373676.pdfIn PDF document text
- http://westernstudioservice.com/admin/userfiles/file/biduxoderu.pdfIn PDF document text
- http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bfddc2e0a5a---88566888398.pdfIn PDF document text
- https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/5rqtro9dge20e55m4gshv2bh9t/ninovizofejek.pdfIn PDF document text
- http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608924f041aa2---fewomaruseg.pdfIn PDF document text
- http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1609b455af2edb---67423186465.pdfIn PDF document text
- http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d2ebe92b0---40501518682.pdfIn PDF document text
- https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/o7qe0ea1dko3v4tbblcjr12er6/55414941011.pdfIn PDF document text
- http://asesorgubernamental.com/images/file/21453876728.pdfIn PDF document text
- https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/363187f35a61b4b51b725ff3ee3cf735/bufexogapiwefine.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_off0000f1c1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF1C1	17316 bytes
SHA-256: `153aa8bfbc1563360fdd98157c6d385211e14bcb378ec21c70bb63d9db1a5e65`
`font_01_sfnt_off00011f00.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11F00	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013717.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13717	10196 bytes
SHA-256: `fe7b935fe498aed3be9b0d9355ab41c2108edbc45a45e2da5478529a15efbd3b`

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