PDF malware analysis — malicious · 4264cbf00ad28697

MALICIOUS

PDF

75.7 KB Created: 2021-09-29 04:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 0106572c5489d18922a812a57cb303f3 SHA-1: 24d734a9c7d18b5de2a38d45dfdd4bf1e61d484f SHA-256: 4264cbf00ad286974486c6d6fbeb2a77028590d53c661e751b2a030cf7ba26d5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it's designed to redirect users to potentially harmful websites. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, as these are common tactics for distributing phishing content or malware. No scripts were extracted, but the overall structure points to a phishing or malware delivery lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://synerhu.ru/uplcv?utm_term=hack+de+gunship+battle PDF link annotation
- http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146e7c3c218b---wakekevuradupo.pdfIn PDF document text
- https://iuoshili.com/upload/users/files/faxizegejuzuwavupug.pdfIn PDF document text
- http://cz-synergy.cz/data/file/wivemozovotu.pdfIn PDF document text
- http://gasthaus-steinkirchen.de/img/editor/file/72764309869.pdfIn PDF document text
- http://kxnjl.com/userfiles/files/33724942698.pdfIn PDF document text
- https://metrosecuritynepal.com/assets/userfiles/files/wikaguraliposikodilanu.pdfIn PDF document text
- http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613d79e7919d2---3617806035.pdfIn PDF document text
- https://eko-briketes.lv/userfiles/files/kipalatinunubebukuf.pdfIn PDF document text
- https://leavereview.com/customerinterview/ckfinder/userfiles/files/91649075466.pdfIn PDF document text
- http://gamaxmotor.cz/data/dokumenty/49750655362.pdfIn PDF document text
- https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a68500c2c4---jumetiwomizutidezajunal.pdfIn PDF document text
- http://telegid.tv/userfiles/file/moloxananunodilazir.pdfIn PDF document text
- http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16150ea50ab2fa---diwid.pdfIn PDF document text
- https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/161403c1da7b59---pominasuzobanedet.pdfIn PDF document text
- http://asia-test.informacittadino.net/media/files/1599479654.pdfIn PDF document text
- https://7mark3t2-7aya.com/contents/files/bokuf.pdfIn PDF document text
- http://dyglas.com/userData/board/file/3502018979.pdfIn PDF document text
- http://meyergarden.com/ckfinder/userfiles/files/74528128354.pdfIn PDF document text
- http://basaritarim.net/admin/editor_resim/file/98916003034.pdfIn PDF document text
- http://cc-loges.com/uploads/file/3392193345.pdfIn PDF document text
- https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/c2nrhr0qurdhb01osv2fhuefoo/lagotiwuwekudirevitezit.pdfIn PDF document text
- http://prochem.vn/images/uploads/files/72549032760.pdfIn PDF document text
- http://pandoraecza.com/genelresimler/file/77634301728.pdfIn PDF document text
- https://tmtteks.com/files/77389767733.pdfIn PDF document text
- http://asupuro.com/upload/save_image/files/pizej.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_off0000c2e2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC2E2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000daf9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDAF9	10896 bytes
SHA-256: `44d9759f1171812eb7a323d36560945de18f0c6791b2fceaa53c1eeb85e7f138`
`font_02_sfnt_off0000f3a4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF3A4	17636 bytes
SHA-256: `efbd13c3b42f405ffe4a238c4741a7d027b69b23627187ca5facd18066a40de0`

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