PDF malware analysis — malicious · ddbdea1e7c4f8c23

MALICIOUS

PDF

84.6 KB Created: 2021-09-03 22:35:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 3b07ebd894c679b58c07c5e7edf0ce4e SHA-1: 974ef3064f8259b469916abbca6ac71d423dc872 SHA-256: ddbdea1e7c4f8c238978732386eef0a2cb6ff3fe15d54b858d5bfa9ceb895405

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URIs and link farm patterns pointing to compromised websites, suggesting it's used to redirect users to malicious content. The presence of multiple PDF link farm heuristics and external URI firings strongly suggests a phishing or malware distribution lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9922

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://ketchas.ru/uplcv?utm_term=political+science+pdf+notes+class+11 PDF link annotation
- https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd8c6b1da6---xafuwukududuwafidanivir.pdfIn PDF document text
- http://xz-brand.com/ckfinder/userfiles/files/92835766101.pdfIn PDF document text
- http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7b56d9c428---77768330590.pdfIn PDF document text
- http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/3ef068b3ec5b96bf52cfe6819b148c3d/wofetefutin.pdfIn PDF document text
- http://nesthomes.in/userfiles/file/wevidopel.pdfIn PDF document text
- https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/850501eb330dc65756fa941957bfd832/vidumigowipogiroxenapi.pdfIn PDF document text
- https://www.marjojaspers.nl/ckfinder/userfiles/files/26011931631.pdfIn PDF document text
- http://gamjagolla.com/uploads/files/relasel.pdfIn PDF document text
- http://drlalashow.com/php/billboard/uploads/file/11133189583.pdfIn PDF document text
- http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3517a4508---tupepo.pdfIn PDF document text
- https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/226144ca4a70f4994cfc6f85670144f6/80238088917.pdfIn PDF document text
- http://studiogeologicotrilobite.com/userfiles/files/fixakogeseluzex.pdfIn PDF document text
- https://aimara-bg.com/userfiles/file/43773058798.pdfIn PDF document text
- https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/qcamo8ujt3sot78umuhibe96h0/tegukukikawukatofajexapap.pdfIn PDF document text
- http://serramentisiciliano.it/userfiles/files/daxavuson.pdfIn PDF document text
- http://alliance-ltd.com/userfiles/8592104886.pdfIn PDF document text
- https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d986ee66790---nokatadowubiwatefe.pdfIn PDF document text
- http://tcgardening.com/userfiles/file/2021081613502573499.pdfIn PDF document text
- https://jackyrouxmethode.com/userfiles/file/nugosujabixuliniwewezotiw.pdfIn PDF document text
- https://koncnc.com/genelresimler/file/31693824868.pdfIn PDF document text
- https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/46af51570d6398201fb92ca073b8bd6f/buwakenunuvegufazof.pdfIn PDF document text
- http://hasdeu.md/data/userfiles/files/85661015786.pdfIn PDF document text
- https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a586a518900---17390356842.pdfIn PDF document text
- https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/ab9fde46617d309465410404b00e8f0d/3575396884.pdfIn PDF document text
- http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcb02cdab2---46569834074.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d9be.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD9BE	10568 bytes
SHA-256: `676a6af0de95d2a1d66f381d680ad5497df1859b9dba877674cc0a275e90238b`
`font_01_sfnt_off0000f200.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF200	1680 bytes
SHA-256: `6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc`
`font_02_sfnt_off0000f9f8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF9F8	19540 bytes
SHA-256: `240a813da3f4d2c0bcab1dddcb1eebba5a82727aafc3ce578dc2fe9595d081d7`
`font_03_sfnt_off00012c51.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12C51	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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