PDF malware analysis — malicious · 8c54aa6eff8e2498

MALICIOUS

PDF

72.0 KB Created: 2021-06-11 04:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11

MD5: 41a77953fee7a25903eb317ad726a5d0 SHA-1: 48978c85bb4aa6e9910af6e351730464efa50a02 SHA-256: 8c54aa6eff8e24986b434198191df5a0c0fcd5936f7de270e5f190e2c9b0861e

194 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains numerous embedded links, many pointing to compromised WordPress sites and algorithmically generated URLs, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. The document body, though partially corrupted, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, which aligns with the presence of external links.

Machine Learning

Nyx PDF Classifier malicious score 0.6398

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK

PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
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
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://drafthe.ru/uplcv?utm_term=gelatin+sheets+to+agar+agar+conversion PDF link annotation
- http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/6efdc759f5b90c4b5c19ef72883ffbf1/26188541698.pdfIn PDF document text
- http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/pukidivomaloxof.pdfIn PDF document text
- http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade77db412f---jariloxotobinuziwuruvo.pdfIn PDF document text
- http://ipmarketing.net/userfiles/file/96438810854.pdfIn PDF document text
- https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abdd129e67c---182539994.pdfIn PDF document text
- http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/trt9psjmmu7qv5dcfig6rntpnn/4912832265.pdfIn PDF document text
- http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/1ab2fa29a8feca38860d66303bf8429a/27418578339.pdfIn PDF document text
- https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/24f1ffa7837848f8e9e36b8ee6da3a63/dapizamulivoriperavoluk.pdfIn PDF document text
- http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cacbec430e---83601320525.pdfIn PDF document text
- http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608748c3e2f77---85692071463.pdfIn PDF document text
- http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/166db711068a52733368f4ab3abd2591/17750591615.pdfIn PDF document text
- https://getadoc.in/ckfinder/userfiles/files/poletarefivobajodekuki.pdfIn PDF document text
- https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/j4scif6t8dq59mls5gup6uaeij/58053123682.pdfIn PDF document text
- http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072af5047948---72689093788.pdfIn PDF document text
- https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609acef9572f9---sirexoxux.pdfIn PDF document text
- http://flirdining.com/uploads/files/foketaz.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://www.daltonmaag.com/In PDF document text
- http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000defa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDEFA	4940 bytes
SHA-256: `d4c8dbb3d9e4e528266fcfcea76c227b17ef90365a2d9cf9b93b8259da7a8ae3`
`font_01_sfnt_off0000efc2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEFC2	10968 bytes
SHA-256: `e4cb494a51d7d9ca9a72220eda5d03862739690017ddc599c22646e312a7cb05`
`font_02_sfnt_off000114f2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x114F2	4324 bytes
SHA-256: `d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378`

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