PDF malware analysis — malicious · 367dd438759f98e1

MALICIOUS

PDF

77.5 KB Created: 2021-07-24 11:27:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 573b12104a16c320470d6a5a3ab03051 SHA-1: 1de94c174f7b7900c5ec10b8c215290884dbc781 SHA-256: 367dd438759f98e1c43fb95330c3cfe7b180ec6115232322374f3f10c8c7fc33

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload sites and other potentially malicious domains. The presence of numerous embedded URLs, many pointing to disposable hosting, strongly suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

Nyx PDF Classifier malicious score 0.7561

Heuristics 5

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
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://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40f628461e---ketaridoxuzimex.pdf In PDF document text
- http://barcelonasixtytwo.com/userfiles/file/53416283272.pdfIn PDF document text
- http://techsystem.gr/data/uploads/ckeditor/files/xekab.pdfIn PDF document text
- http://abwcoliseum.com/uploads/files/83157167058.pdfIn PDF document text
- https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/867fafa19a2f7c5cd83767f2d3fdce83/mejagonafuputesunud.pdfIn PDF document text
- https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/7mbs2802rj5a0pjtm9sq0av9hk/gonezokurepetowamelim.pdfIn PDF document text
- http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609605a01fa34---98904348337.pdfIn PDF document text
- http://kuzfarm.ru/images/file/25215949525.pdfIn PDF document text
- https://eurouniversal.eu/ckfinder/userfiles/files/kabatedepinu.pdfIn PDF document text
- https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094739ab1b9b---gepulurisoloderuki.pdfIn PDF document text
- https://pernambucoimortal.com/imagens/files/1438749398.pdfIn PDF document text
- http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093bf66cf3ce---nusum.pdfIn PDF document text
- https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085507d405f2---rakokunobisanixazivilogo.pdfIn PDF document text
- https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/ut6p7d3f2omrb6edf4ljk7524c/nejuxobebeluw.pdfIn PDF document text
- https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b59e871efda---pajodunabawikinipi.pdfIn PDF document text
- https://cuatudongbinhduong.net/uploads/files/disozeba.pdfIn PDF document text
- https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/n2ktmkjmiee5ckm8tmkd9qlqu2/kesaritudenoza.pdfIn PDF document text
- https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7dda8561e---20150654172.pdfIn PDF document text
- https://cristalparkhotel.com/ckfinder/userfiles/files/jagojepetotaliso.pdfIn PDF document text
- https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608044e24c200---74808924308.pdfIn PDF document text
- https://cgeminfos.ma/upload/file/19912495408.pdfIn PDF document text
- http://ahsaipu.com/v15/Upload/file/20215552652053.pdfIn PDF document text
- http://deltools.com/userfiles/file/kabonafafonavimemanaji.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=world+conqueror+3+cold+war+mod+apkPDF link annotation
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e967.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE967	17084 bytes
SHA-256: `3a7a36aece3e988190982bd7b196add99d4745e6628b1db53be68c7cadcf079b`
`font_01_sfnt_off000115d9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x115D9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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