PDF malware analysis — malicious · 823792d2b1c05a6d

MALICIOUS

PDF

75.3 KB Created: 2021-09-12 07:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 707201f3f1d1d994a7fdaed510cc1244 SHA-1: 4711c6ed7d3a0dcd0c67dc55ab958a75520ac5ca SHA-256: 823792d2b1c05a6d5d0be89ad1839359ef8a78271f0adfabd83cbdefbc34706d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but containing embedded URLs.

Machine Learning

Nyx PDF Classifier malicious score 0.9908

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://99shayari.in/userfiles/files/78227552416.pdf In PDF document text
- http://lineshare.net/upload/files/20210912063830.pdfIn PDF document text
- http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5b552c0b7---8446269964.pdfIn PDF document text
- https://archielectronics.com/userfiles/files/25745351581.pdfIn PDF document text
- http://ateliergermain.club/sites/default/files/file/91057515621.pdfIn PDF document text
- http://awarelaxcentrum.cz/user_files/file/33356408571.pdfIn PDF document text
- https://ckmusicdesign.nl/userfiles/file/80631842621.pdfIn PDF document text
- https://silverlabpupsforsale.com/userfiles/files/35837947116.pdfIn PDF document text
- http://erbamedica.org/userfiles/files/fofidexemisazowagalozeje.pdfIn PDF document text
- https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/46220820480.pdfIn PDF document text
- http://metisentry.net/ckfinder/userfiles/files/tobet.pdfIn PDF document text
- http://come2menorca.com/images/file/zakipubi.pdfIn PDF document text
- https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/gurikemitaf.pdfIn PDF document text
- https://anakmeong.com/contents/files/78730026163.pdfIn PDF document text
- https://ontech.vn/images/ckeditor/files/71084703420.pdfIn PDF document text
- http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pexeluxaxogojiturisaf.pdfIn PDF document text
- http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/gijerotefejatefulesamaj.pdfIn PDF document text
- https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16130d526c83fa---19800183725.pdfIn PDF document text
- https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/86949534e26f46f13af311597d28db12/82973963193.pdfIn PDF document text
- http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613392979d1b2---noboje.pdfIn PDF document text
- http://kcpsystem.com/userData/board/file/3908260696.pdfIn PDF document text
- http://dymenahealthcare.com/upload/fckeditor/file/xugulobemegeni.pdfIn PDF document text
- http://cjmfgxfollow.morefriendship.com/upload/files/41980699624.pdfIn PDF document text
- http://vivo-mebel.ru/upload/file/watajulob.pdfIn PDF document text
- https://suacuachuyennghiep.com/uploads/files/golomelitatuk.pdfIn PDF document text
- http://gpszone.hu/upload/userfiles/file/88385502404.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=snyder+cut+on+hbo+maxPDF link annotation
- 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_off0000c18e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC18E	17420 bytes
SHA-256: `f2b745584869d04934bb64aff77cb6fd9343dbd7067d78300dc99a4201119825`
`font_01_sfnt_off0000eec6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEEC6	10860 bytes
SHA-256: `0d5a7cb10d04af6fe5e5affbef86a41f33690714fa5e6cbb3976367d9512555d`
`font_02_sfnt_off000107b7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x107B7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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