PDF malware analysis — malicious · cff7e6ef94a17a43

MALICIOUS

PDF

89.4 KB Created: 2021-07-30 07:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21

MD5: b9063e3d6d031a4e755bcae130b72039 SHA-1: b717c0f3b4f7ffbbb07fb9382b5f827978802823 SHA-256: cff7e6ef94a17a432ada63499cd85bb411de6feaf773e8599b73a6e11d0af91a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript, though not fully detailed here, is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

Nyx PDF Classifier malicious score 0.9990

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://philabc.ru/uplcv?utm_term=hindi+alphabet+writing+practice+book+pdf PDF link annotation
- http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/4dc73b342085b03734eace4c456651f7/9827160210.pdfIn PDF document text
- https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/uvel890vvp4pue5sspuiov0db3/3404726403.pdfIn PDF document text
- https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/9410785253947dcf8a910deb6ad8d7dd/72257971048.pdfIn PDF document text
- https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078cb1e3e1dc---tovotewe.pdfIn PDF document text
- http://bephoangdung.vn/uploads/ckfinder/files/mupoteleniz.pdfIn PDF document text
- https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c93d98a8ce---fojujifowaduvedowig.pdfIn PDF document text
- https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16089ddcd54861---fuputazejidumawupoga.pdfIn PDF document text
- https://istocdukkan.com/userfiles/files/53421830229.pdfIn PDF document text
- https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/253130ab671205cb9f31a8db95387db8/80742759820.pdfIn PDF document text
- https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af4036743d3---62996451232.pdfIn PDF document text
- https://topjobsnepal.com/ckfinder/userfiles/files/dodiwigukemudov.pdfIn PDF document text
- http://0-50.ru/userfiles/file/96567810012.pdfIn PDF document text
- http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843159bc521---xifuludekusasirefiva.pdfIn PDF document text
- http://phuquytravel.com/nguyenvanlinh/files/gimeso.pdfIn PDF document text
- http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b1a93c08e---bikupulelafoboduwuvo.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bac06ae14ee---77614925278.pdfIn PDF document text
- https://nocnepal.org.np/ckfinder/userfiles/files/waloforukovunevuxup.pdfIn PDF document text
- http://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1089523968---rexoxudidotiliguf.pdfIn PDF document text
- http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f06ba8cc2a---7361849719.pdfIn PDF document text
- http://ateliergermain.net/sites/default/files/file/sixagefugu.pdfIn PDF document text
- http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34e6aa31cc---4496776998.pdfIn PDF document text
- https://posaonakosovu.com/ckfinder/userfiles/files/pimamudesaj.pdfIn PDF document text
- https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/3d261c492a340c2bd429c8dd1073ac83/24554078195.pdfIn PDF document text
- https://mytopics.it/uploads/file/xofojisugirujumakif.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_off0000fa71.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA71	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00011288.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11288	11040 bytes
SHA-256: `85ac4d8f3317e8c5da8b81b6d57391d9c2c63a75d7ae011281302505270aec9e`
`font_02_sfnt_off00012ba7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12BA7	16796 bytes
SHA-256: `13c75a604212ca31c54034f84e918eb73c044b95be4077a1551c4a7f3082e7e7`

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