PDF malware analysis — malicious · 7dee88f86a950899

MALICIOUS

PDF

90.3 KB Created: 2021-09-17 03:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 65ea525798f8989554ce92e82a780278 SHA-1: cc772b5d68e3bdc474a8991a027a7fb226be98e6 SHA-256: 7dee88f86a9508994d0687cef3b4c9bf353bd25a68c4f46c3ede13badff7beb9

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of embedded links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of numerous external URIs and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614063a860731---pemusitiredo.pdf In PDF document text
- https://inprovitecuador.com/ckfinder/userfiles/files/soraninofopifaxubi.pdfIn PDF document text
- http://citygclub.com/ckupload/files/93827101375.pdfIn PDF document text
- http://patanamachine.com/imgUpload/files/wuzukowebemipatipafiraxux.pdfIn PDF document text
- https://unique.global/wp-content/plugins/super-forms/uploads/php/files/725ef7b3fd6262bbd0bd42d4c1556337/56395906579.pdfIn PDF document text
- http://paoladebenedetti.eu/userfiles/files/wopenebonedokijusokuwetir.pdfIn PDF document text
- http://itkaufmann.com/images/fckimages/file/danipofitejiwejasixivolu.pdfIn PDF document text
- https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/65613add6c1f93d774673db70160b953/2460326080.pdfIn PDF document text
- http://portableandcool.com/files/files/dufolari.pdfIn PDF document text
- https://tutorsbureau.net/userfiles/file/3747645733.pdfIn PDF document text
- http://globalsublimation.net/uploadfile/files/zixajonavexuguwavage.pdfIn PDF document text
- https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/ou9e0kkakeaadrgjkos2mip497/11829764219.pdfIn PDF document text
- http://atletika-pardubice.cz/files/file/suvuluwij.pdfIn PDF document text
- https://inoxquochoang.com/app/webroot/files/images/pages/files/jaxutunate.pdfIn PDF document text
- https://zapcdn.space/web/img/podborky/files/kekejorazozijezujuw.pdfIn PDF document text
- http://de.ruben.pl/ckfinder/userfiles/files/vobamefakofeteg.pdfIn PDF document text
- http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613275bc3aeeb---64049492120.pdfIn PDF document text
- http://kimwendelldesign.com/ckfinder/userfiles/files/luvegamujazilazofisafebem.pdfIn PDF document text
- http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/19164529315.pdfIn PDF document text
- http://pmke.cz/pictures/files/juwamowo.pdfIn PDF document text
- http://strandedtattoo.com/file/labesijokipigexovalepiful.pdfIn PDF document text
- https://livstyle.ro/home/livstyle/public_html/uploads/files/nibokidekigerix.pdfIn PDF document text
- http://eviljoy.com/UserFiles/File/44239969516.pdfIn PDF document text
- http://sportingfoundation.com/uploads/file/jajakavebenifudu.pdfIn PDF document text
- https://melz-feu.ru/upload/wemoxeperam.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=roblox+powering+imagination+generator+free+robuxPDF 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_off0000fa66.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA66	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0001127d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1127D	11004 bytes
SHA-256: `388dadfa86a412f5d56fbbbc4e4d0617d91246e4d4faeaa6cff046a7ff263456`
`font_02_sfnt_off00012be8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12BE8	18120 bytes
SHA-256: `329e9f81775cfa8f571faebd6ac3423a1e8a8b91e3114efb7846449456af7a17`

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