PDF malware analysis — malicious · 1216c6c9a025e96c

MALICIOUS

PDF

82.6 KB Created: 2021-09-03 04:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: de383f53b6d84eb6a78f3c20922f0eee SHA-1: 740e2ceefa7387c3f5666ff1d640dacb65664efa SHA-256: 1216c6c9a025e96c8d25ac3d8d0cc4a6b0b05ab574d32deffb69c6f5137f0572

96 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 WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external URIs and a link farm heuristic further supports its malicious nature. No scripts were extracted, but the primary function appears to be directing users to potentially harmful external content.

Machine Learning

Nyx PDF Classifier malicious score 0.9911

Heuristics 5

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=dogar+aptitude+test+book+pdf+download PDF link annotation
- https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/es35kahfrcasi4lhkrpai2qjvr/sagose.pdfIn PDF document text
- http://szyoujin.com/UploadFile/file/20210828192429092.pdfIn PDF document text
- http://kirakuramen.com/uploads/files/neditevuletoz.pdfIn PDF document text
- https://mma-montessori.com/admin/ckfinder/userfiles/files/vudepemisanadurezugese.pdfIn PDF document text
- http://khodahoanglang.com/admin/webroot/upload/image/files/mukenoponofivesuvufal.pdfIn PDF document text
- https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/102tdl3baggq79eio09370qcnc/zuxalameviwitiges.pdfIn PDF document text
- http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/84505995540.pdfIn PDF document text
- http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9b677bb80---kogulofamozi.pdfIn PDF document text
- https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a94a47b5a5---gijufegotalitaroxedoxevu.pdfIn PDF document text
- http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/jumananivubelijewaxiraw.pdfIn PDF document text
- https://perfecthospital.net/FCKeditor/file/nidebuzejemosalave.pdfIn PDF document text
- https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/974990c8b55261dea7584e6357e36d90/mitexebutezusod.pdfIn PDF document text
- http://sarlampa.ru/upload_picture/gosido.pdfIn PDF document text
- https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/ejoor71c016dpilqhqsubb0tlc/dimaje.pdfIn PDF document text
- https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc50ddb3b81---18903285443.pdfIn PDF document text
- https://actorconseil.com/files/file/20934029239.pdfIn PDF document text
- http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2nger26m8aro6ioin9ulbio9f0/84718960713.pdfIn PDF document text
- https://nabsangram.com/userfiles/file/91949348271.pdfIn PDF document text
- http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb28ba6f4b8---48107818176.pdfIn PDF document text
- http://churchtextile.com/userfiles/file/pururakediwekoborepaz.pdfIn PDF document text
- http://sistersaviopublicschool.com/userfiles/file/lovajakozu.pdfIn PDF document text
- https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92425e280e---xoporiva.pdfIn PDF document text
- http://netdepphunu.vn/images/userfiles/file/568984063.pdfIn PDF document text
- http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/36431301802.pdfIn PDF document text
- http://easyreturn.store/userfiles/file/68284450560.pdfIn PDF document text
- https://lawina-radom.pl/files/file/nigixelofibu.pdfIn PDF document text
- https://ddmmaze.altruistictech.org/documents/img/upload/files/mexojikabalazorututuwu.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_off0000dd87.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD87	17428 bytes
SHA-256: `1f965502042c7277e4c071c31a3b9f23d78b99509eee3cfc21d4d96d5625fa85`
`font_01_sfnt_off00010a94.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A94	11092 bytes
SHA-256: `0870c202d41637845cf801f38c8361f2b43fe6fdf46843396cc1d026552da7c5`
`font_02_sfnt_off00012435.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12435	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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