PDF malware analysis — malicious · 24a441e7401fdffc

MALICIOUS

PDF

83.6 KB Created: 2021-07-06 14:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 358408e17f06be38cd02b7c527bb2484 SHA-1: afea6027df438528c1bdfe556341c96f3caa58b1 SHA-256: 24a441e7401fdffcdadf316278cd4709e7fe43980146adcc00708c27793b0359

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content or downloads. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports its malicious nature. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

Nyx PDF Classifier malicious score 0.9860

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://inwebjor.ru/uplcv?utm_term=download+sd+maid+pro PDF link annotation
- https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d45dc083e---68420367974.pdfIn PDF document text
- http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/9aceca24b01adcc2593027c854badd73/48088577269.pdfIn PDF document text
- http://rajskiewakacje.pl/userfiles/file/2468637603.pdfIn PDF document text
- https://grandplaza.bg/uploads/assets/file/guwonalilefenuxagoxedubi.pdfIn PDF document text
- http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4c0a776a7---30734135038.pdfIn PDF document text
- https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/efef8ce69d4372462686729b712889fe/4537121915.pdfIn PDF document text
- https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160801354167a6---72399964675.pdfIn PDF document text
- https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/52cb67b631a393f7067d8c4684ff505f/fovumafo.pdfIn PDF document text
- http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160965748d2922---tosikazokow.pdfIn PDF document text
- http://cateringkieuan.com/uploads/userfiles/file/pukedanelixe.pdfIn PDF document text
- https://angkortaxiservice.com/userfiles/file/15834373227.pdfIn PDF document text
- https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a702ca2afe2---77376134468.pdfIn PDF document text
- https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/bff552556afb7c439bb59709e8b5f7e7/rozodelapulilemepajevun.pdfIn PDF document text
- https://vinacomvietnam.vn/uploads/news_file/67104787356.pdfIn PDF document text
- http://botosani.ro/img/uploads/file/57784708966.pdfIn PDF document text
- https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/run2reajcl0v777306t99vn00g/38891645348.pdfIn PDF document text
- https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/facacf43ad98c6d843d84764ca389503/17316079652.pdfIn PDF document text
- https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/4441ced1284d971da3a71937bcbfbfa4/6887093744.pdfIn PDF document text
- http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bdacb34b0a2---84864053361.pdfIn PDF document text
- http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c19f5c458---poxopak.pdfIn PDF document text
- http://faradtvandor.hu/picture/userfiles/file/fibifemapunuruzulikazuk.pdfIn PDF document text
- http://kawoka.com/userfiles/file/63717156646.pdfIn PDF document text
- http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9aef9b7dde---xusanazokenug.pdfIn PDF document text
- https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/9166fbabcb019f6bc4d3f56e21271e00/95872940884.pdfIn PDF document text
- https://horgaszvelem.hu/ckfinder/userfiles/files/56165471538.pdfIn PDF document text
- http://quiltingacademy.info/fckeditor/userfiles/file/pusafijebiwas.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_off0000e68d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE68D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000fe9f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFE9F	16572 bytes
SHA-256: `a2996de20af7e3683ede74b504bbcff9dda45577bc30b40f260a3b36123ef36e`
`font_02_sfnt_off000129f7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x129F7	10412 bytes
SHA-256: `703f866bfca09e612292c370a50c984f3dcaffd6fe3fcf147b50af58479f8556`

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