PDF malware analysis — malicious · 5b76cb40ac7e78df

MALICIOUS

PDF

89.1 KB Created: 2021-06-25 16:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05

MD5: f3ac3759ce39ff0e7ea1f6ad6cb8ed99 SHA-1: 9f9602007f10ae7c9d88fc0a0760bce096f0a079 SHA-256: 5b76cb40ac7e78df43ed737f8f3fd52c2df60f6fd7c6255f6ce6ca37d5a71a4f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites. These links likely serve as a lure for phishing attacks or to distribute further malware. No scripts were extracted, but the structure and embedded URLs strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9991

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://wastran.ru/uplcv?utm_term=phd+ppt+templates+free+download PDF link annotation
- https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/08ec21a2a0664d350332a441ae6516a2/96800258400.pdfIn PDF document text
- http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160810693312ba---pusudebafugujek.pdfIn PDF document text
- https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/840c4f83d2e59facf866fa11a2a9b19c/4405758728.pdfIn PDF document text
- http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bb0899435---28866933129.pdfIn PDF document text
- https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60a7c152d5---butukefuwevafevitupaj.pdfIn PDF document text
- http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/7e2f4df2180483881ff6c472d21d7584/26130556121.pdfIn PDF document text
- http://webinaris.training/ckfinder/userfiles/publics/files/41493157446.pdfIn PDF document text
- https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/65a58934f59430005f482c31cd2a09bc/tokadivobapenogog.pdfIn PDF document text
- https://nhachoxebus.com/upload/fck/file/62142093894.pdfIn PDF document text
- http://jmdfhjl.com/fckeditor/userimages/file/fusepazu.pdfIn PDF document text
- https://maggies-handmade.com/UserFiles/files/47387827307.pdfIn PDF document text
- https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be405fc933f---80153357033.pdfIn PDF document text
- https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/05f3025964cb8ccc52733ca3c2b65ec1/36122007151.pdfIn PDF document text
- http://domholidays.com/userfiles/file/42125694411.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_off0000fb60.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB60	10756 bytes
SHA-256: `1c7317f53abbedafebc4f9a7fd30dd3400fd18f8f5b3473e4c5ec0a3045db763`
`font_01_sfnt_off00011402.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11402	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012c14.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12C14	16796 bytes
SHA-256: `446947894f648c128e55b6a13cf809d046c57a442a1a32401a9e7427f3f22abe`

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