PDF malware analysis — malicious · 6d9de2ea71696787

MALICIOUS

PDF

81.9 KB Created: 2021-09-06 07:23:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: e1ce6dba8d5c88b541b5e60f5f9e7d44 SHA-1: 8cbcb19ba82de3108972d336280119ee527878e3 SHA-256: 6d9de2ea71696787746fc785d66193030ce154579c7d77abed340544970691ea

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to potentially compromised websites, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, as these indicate attempts to leverage search engine optimization and compromised infrastructure for malicious redirection. No scripts were extracted, but the overall structure and URL patterns are consistent with a phishing lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://irlanc.ru/uplcv?utm_term=programme+cycle+3+sciences+pdf PDF link annotation
- http://yokohama-model.com/userfiles/files/20971332421.pdfIn PDF document text
- https://eminenceconstruction.ca/viking1/uploads/files/19648877748.pdfIn PDF document text
- https://madspot.dk/ckfinder/userfiles/files/13904772385.pdfIn PDF document text
- https://hyundainhapkhau.vn/upload/files/zaborumonawisinig.pdfIn PDF document text
- http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee9094659d---57552309047.pdfIn PDF document text
- http://megaprestige.ru/uploads/files/rexusapaborat.pdfIn PDF document text
- http://ever0036.com/assets/uploads/ckedit/files/20210906062706.pdfIn PDF document text
- https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/989d7e111d68d22faa976ba8f319ba21/lutuk.pdfIn PDF document text
- http://ulleungroadtour.com/FileData/ckfinder/files/20210716_E2222155EC09B2B6.pdfIn PDF document text
- https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702c7369a86---zijebe.pdfIn PDF document text
- https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/8e7d99cddab4c95078f5bff8d647edbc/javurijovutesatem.pdfIn PDF document text
- http://interiorsexpress.biz/dayafter/uploadimages/newsimages/file/kufadizikug.pdfIn PDF document text
- http://zetrade.cz/userfiles/file/13539625997.pdfIn PDF document text
- https://poolpoint.be/uploads/file/44155441402.pdfIn PDF document text
- https://dovolena-jiznicechy.cz/uploads/runogakuko.pdfIn PDF document text
- http://ues-rb.ru/themes/ues-rb.ru/files/xabebakamemi.pdfIn PDF document text
- https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/7kchn6iljifd6jinaefg1r2vl3/40031587607.pdfIn PDF document text
- http://xecuoihuyhoang.com/uploads/userfiles/file/wefanap.pdfIn PDF document text
- https://petrovsky14.ru/docs/files/89255028243.pdfIn PDF document text
- http://k-sta.kr/FileData/ckfinder/files/20210802_6ECD6EB4E8FBD1AF.pdfIn PDF document text
- http://www.themixchange.com/userfiles/files/mufujonefu.pdfIn PDF document text
- http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c392ca1b4---wegogubatozadali.pdfIn PDF document text
- https://mfdesign.hu/files/file/gebaxoxosebogodixafun.pdfIn PDF document text
- https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886ab1c2df3---7807612927.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_off0000d7b8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD7B8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000efca.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEFCA	18996 bytes
SHA-256: `9898f0b1637c4a82abb221ac167d7fe36104b6f47dec60f1ca6255dd8f8404f3`
`font_02_sfnt_off0001203a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1203A	11152 bytes
SHA-256: `eb292c12366c8aea65d8321867c735cd0a75cc0c3c3b0727d9bd4c5f3d27c801`

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