PDF malware analysis — malicious · 92b9cfd4f081b794

MALICIOUS

PDF

85.1 KB Created: 2021-07-08 05:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15

MD5: dffdebd4243838b387306708c72a2dbb SHA-1: f33c230fb91c192dd6a585859b2c2b6d990d675d SHA-256: 92b9cfd4f081b794502ae4567aa232b34801c9daae82e13f0528dabd0dd95d35

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites, suggesting a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves directing users to potentially malicious websites via a link farm.

Machine Learning

Nyx PDF Classifier malicious score 0.9849

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://crysiq.ru/uplcv?utm_term=large+rove+beetle PDF link annotation
- https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/be52561916a70dc47c87873585bb01f8/geluzevitelor.pdfIn PDF document text
- http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9c0f75d55---nevijuduxemogirim.pdfIn PDF document text
- https://angkagenap.com/contents//files/kobaw.pdfIn PDF document text
- http://naasschoolofmotoring.ie/fckeditor/userfiles/file/venimewosekik.pdfIn PDF document text
- https://brazilairporttransfers.com/ckfinder/userfiles/files/bosibuzivadutijamov.pdfIn PDF document text
- http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160e1ebcd4f96a---36965684795.pdfIn PDF document text
- http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/dsqmg4e6s6ke6jks61id6qe536/50050675763.pdfIn PDF document text
- http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075e4394564a---xixipubometoboxa.pdfIn PDF document text
- http://okzawidow.pl/img/upload/files/35378528286.pdfIn PDF document text
- http://ekotop.eu/userfiles/file/mukudidepefono.pdfIn PDF document text
- https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a1b011094a57f4522d786eb0542bd265/8292799089.pdfIn PDF document text
- http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076657a58f68---93045685731.pdfIn PDF document text
- https://egyptsuntours.com/userfiles/files/farazimokebironemuvibit.pdfIn PDF document text
- http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8268a36fa0---2753407766.pdfIn PDF document text
- https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/lib7jbq2pt8da6edg1cld865p2/22234717780.pdfIn PDF document text
- https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/1677732d997d246dddd3da46123d52ef/lowezofudikurof.pdfIn PDF document text
- http://kojeneckezbozi.eu/userfiles/file/53031188039.pdfIn PDF document text
- http://drjoecarver.com/clients/49355/File/xagolafubasu.pdfIn PDF document text
- http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b012465f28d---9258865265.pdfIn PDF document text
- http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1f61194e2---9360411733.pdfIn PDF document text
- http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab3c10c800---33765324007.pdfIn PDF document text
- http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/31595526528.pdfIn PDF document text
- http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f9d77698d---jeguz.pdfIn PDF document text
- http://navigator-nsk.ru/userfiles/file/25381051734.pdfIn PDF document text
- https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb76507fdf---37952846422.pdfIn PDF document text
- http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840e1b45622---34303528505.pdfIn PDF document text
- http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc04d63d0d---23928529826.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_off0000ecb0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xECB0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000104c7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x104C7	10084 bytes
SHA-256: `c24411580e7f74084f9fac1a87581f0c79f5e9ff96fbf681348a38696681f5f5`
`font_02_sfnt_off00011b5f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11B5F	16804 bytes
SHA-256: `92301599bb8dafd0d32a6fb0de35d5a8bb2c26be2d757b409dd2b6d5c3cb6094`

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