PDF malware analysis — malicious · dad51d9e6d650e8e

MALICIOUS

PDF

72.6 KB Created: 2021-09-06 09:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: c902a4a2ad2995c7885716a747f0d8b2 SHA-1: 9f406a9fcabd4d619c64535c0377befbe664b3ee SHA-256: dad51d9e6d650e8e3e95206d2e7d53a429a4a9533621e75264404c7b1785ef4f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and URL patterns are indicative of a malicious document designed to lure users into clicking through to malicious destinations.

Machine Learning

Nyx PDF Classifier malicious score 0.9915

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16102e926da326---xofulokapevidideronejole.pdf In PDF document text
- http://fishtech.org/uploads/userfiles/file/file/77374997575.pdfIn PDF document text
- http://csc-0411.com/userfiles/file/20210624070319_4mr9y2.pdfIn PDF document text
- https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/b28ac9a1241f0a9f8b9cd647ad340568/60741814491.pdfIn PDF document text
- http://gesundheit-im-blog.de/userfiles/file/77352719324.pdfIn PDF document text
- https://andhimazhai.com/images/files/5144582950.pdfIn PDF document text
- http://beadsandsupplies.com/images/file/91120791737.pdfIn PDF document text
- http://japan-railpass.info/images/blog//file/15429049679.pdfIn PDF document text
- http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f60eb7551a---75752963067.pdfIn PDF document text
- http://modaxch.com/userfiles/files/wofage.pdfIn PDF document text
- http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/99287517861.pdfIn PDF document text
- https://vico-inmobiliaria.com/ckfinder/userfiles/files/fuvuzesol.pdfIn PDF document text
- http://highlandcougars83.com/clients/2/26/268573c5102cd00412bac87cee9346ec/File/59739753614.pdfIn PDF document text
- https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/c7ba4a19962b96a67ff2d9ef8c336864/1205571309.pdfIn PDF document text
- https://dolnoslaskialarmsmogowy.pl/imgturysta/files/27711421681.pdfIn PDF document text
- http://mapect.com/upload/fckeditor/file/zokepule.pdfIn PDF document text
- https://usssecuritate.ro/userfiles/file/26560805802.pdfIn PDF document text
- https://autosaloncenter.com/uploads/files/bigapilavopimewaxojafe.pdfIn PDF document text
- http://windmill-bv.com/userfiles/files/puwobixesat.pdfIn PDF document text
- http://jeanthompson.nl/ckfinder/userfiles/files/46063155000.pdfIn PDF document text
- http://alessandrobelleseveterinario.eu/userfiles/files/9095445805.pdfIn PDF document text
- https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/452ee5be33dbbd4222023b2c0b08676c/jidulujowijakosa.pdfIn PDF document text
- https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607825c396604---49145662579.pdfIn PDF document text
- https://cqc-material.com/app/webroot/userfiles/files/xedoneborilifaje.pdfIn PDF document text
- http://flirdining.com/uploads/files/49265104018.pdfIn PDF document text
- https://aartipalette.com/userfiles/file/suxitebukifiwadodonix.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=wing+chun+techniques+manual+pdfPDF 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_off0000bcc7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBCC7	11084 bytes
SHA-256: `ff06f77f90dcb6314890d5b3a54fd9181c33d2e5d6ca930ae7e544d0f5313e8b`
`font_01_sfnt_off0000d5e1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD5E1	15128 bytes
SHA-256: `c1df228939c12e29819b0dbbfa9f1890949205afac603abe692a8382c23b1fe2`
`font_02_sfnt_off0000fc32.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC32	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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