PDF malware analysis — malicious · 09745866fbfdbd08

MALICIOUS

PDF

80.6 KB Created: 2021-09-18 20:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: 21cc77b8586dc098be3369ae62ec8c2e SHA-1: b1945488d6821abdc5b34bcef634b5ecb7579ec8 SHA-256: 09745866fbfdbd087cac1e08ebc7310a87db28380d615ce143c504717a25371c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised WordPress installations. The presence of numerous URLs, many with 'utm_term' parameters, suggests an attempt to drive traffic for malicious purposes, likely phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://wastran.ru/uplcv?utm_term=android+11+live+caption PDF link annotation
- http://dnepropress.net/files/file/12076612890.pdfIn PDF document text
- http://csim.jp/ckeditor/uploads/files/24598420506.pdfIn PDF document text
- https://perfecthospital.org/FCKeditor/file/26628994147.pdfIn PDF document text
- http://chothuexehochiminh.com/userfiles/file/12322487656.pdfIn PDF document text
- http://sushigonewildtogo.com/uploads/files/mupojaxojixoxabixokap.pdfIn PDF document text
- https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/bijokefefexolunafi.pdfIn PDF document text
- https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614121671d558---puvuvusegidezowuxujo.pdfIn PDF document text
- http://emons-verlag.net/testarea/cwsCMSlight/media/files/desuzumarimalobuka.pdfIn PDF document text
- http://datong-travel.tw/upload/ckeditor/files/20210911154231.pdfIn PDF document text
- https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/2d536e0bf50745c517daa144e780b7a9/44183435690.pdfIn PDF document text
- http://tienhasteel.com/app/webroot/upload/files/57976954813.pdfIn PDF document text
- http://sicompk.com/survey/userfiles/files/98739025400.pdfIn PDF document text
- https://penal-garazh.ru/files/dokifulux.pdfIn PDF document text
- http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421c6d6a5c0---rozikip.pdfIn PDF document text
- http://thuduchouse.vn/pics/file/wemixevavorujijiligedup.pdfIn PDF document text
- https://saptabangunmanunggal.com/indomobils/upload/file/95898133844.pdfIn PDF document text
- http://unleadedcoffee.cz/soubory/gajikujonopewage.pdfIn PDF document text
- http://pokwuttibut.com/file_media/file_image/file/ribela.pdfIn PDF document text
- http://pekbdt.com/filespath/files/20210903033008.pdfIn PDF document text
- https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/42900437180.pdfIn PDF document text
- http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16145365187b55---pumel.pdfIn PDF document text
- https://semsaesp.com/ckfinder/userfiles/files/nujevilivudadonivi.pdfIn PDF document text
- http://lexxyin.net/files/fckeditor/file/86669851352.pdfIn PDF document text
- http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328992026d9---vivow.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_off0000d6e4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD6E4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000eefb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEEFB	10440 bytes
SHA-256: `edf07ed5807c0bb375974329dff0348ab729ff96822190056e2320e7baf0ff1b`
`font_02_sfnt_off000106cd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x106CD	17780 bytes
SHA-256: `cfdbe98a4c0c59124fd43ce97445277acbde31b438a64e11cf4708da9d93b84b`

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