PDF malware analysis — malicious · 2181cfecc51498a5

MALICIOUS

PDF

148.8 KB Created: 2021-07-02 10:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: d5ded08dd9b11d5aac2f1607fdb49648 SHA-1: 92e4b3d441f2f9175f6fb4fb6872460ff839edf1 SHA-256: 2181cfecc51498a52c4dbdd977e5399f04a2b6affc7b48b724495a3cdef912f9

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs pointing to compromised WordPress uploads and disposable hosting, likely intended to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct textual clues about its purpose beyond its structure.

Machine Learning

Nyx PDF Classifier malicious score 0.9742

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://chcial.ru/uplcv?utm_term=indesign+text+wrap+ignore PDF link annotation
- https://securityguardsupply.com/php/uploads/file/31543101407.pdfIn PDF document text
- https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/933316b085c0ca1abd683e13939a5975/9279787317.pdfIn PDF document text
- http://ajivikafinance.com/userfiles/file/85791947064.pdfIn PDF document text
- http://high-keenltd.com/userfiles/file/67294062456.pdfIn PDF document text
- http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/6a10a382c715dd95740345b16355b18e/13614211408.pdfIn PDF document text
- https://sensorservice.org/userfiles/file/38341277469.pdfIn PDF document text
- https://relans-nn.ru/images/docs/file/minelivofebe.pdfIn PDF document text
- https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/b7cb1227d6a1192147f1df2eb801ff55/72174833018.pdfIn PDF document text
- http://montaze.org/democms/userfiles/file/gowuga.pdfIn PDF document text
- http://aksaaydinlatma.com/img/editor/image/file/37521286134.pdfIn PDF document text
- http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a269c3de5ba---71699688219.pdfIn PDF document text
- https://bisnismedsos.com/userfiles/file/97839095986.pdfIn PDF document text
- http://hulstcustoms.ru/uploads/files/nowaponu.pdfIn PDF document text
- http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/39770183513.pdfIn PDF document text
- https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/02f6a5a60b07fdbb51d2f8011aeaf230/bimajekuputejopenegiwavo.pdfIn PDF document text
- https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/agnf51d7obq4pcoin6unsl0r85/23989800981.pdfIn PDF document text
- http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9900c72bba---sadigogemilosisoxa.pdfIn PDF document text
- https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f1a47e062---rovipobomuxijevowute.pdfIn PDF document text
- http://siltherm.com/ckfinder/userfiles/files/75870586355.pdfIn PDF document text
- https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/f60e3372f58c40da0a410b21975aef68/39741069251.pdfIn PDF document text
- http://oakgroveschoolheritage.com/clients/b/bc/bc5c94904a1f00f1300372e6f875146f/File/1016118564.pdfIn PDF document text
- http://innotack.com/userfiles/files/vonuwatulez.pdfIn PDF document text
- http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/9d886896f623e2ec1dbfc0725a9f71c1/demivizanogilofesolesi.pdfIn PDF document text
- https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/394cbc4e48ad0814e710ad4f1fb7df17/werezowedurumojonofadi.pdfIn PDF document text
- https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609550ba02c49---kuvubeburepixup.pdfIn PDF document text
- https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/55terjcj1m0vfuj4pkjj9epm1i/46511128710.pdfIn PDF document text
- https://avgdesign.com/userfiles/file/7138805596.pdfIn PDF document text
- http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a8dfe7b5a61---sudepimuxelufonifobip.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_off0001e857.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1E857	10660 bytes
SHA-256: `9788c42e75bc6c2fcb6d7843af0961297a922831966eb8d63d76c3af619f2af9`
`font_01_sfnt_off000200bc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x200BC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000218ce.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x218CE	17040 bytes
SHA-256: `1007837e9615470d86419b968dfb4fd2e0f7f8f44e9a076b9a003ce806ab22bc`

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