PDF malware analysis — malicious · 371ed2554dc589ca

MALICIOUS

PDF

65.7 KB Created: 2021-10-01 15:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: 0ff82c1bb60f66ebedafa431deee7b49 SHA-1: db361c1f7e138635bf58259a339211a460449ad9 SHA-256: 371ed2554dc589cad6642be344d96459aaa93bfcfb5d908561dd8972b3c0bb74

124 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The PDF's structure and the presence of external URIs indicate it's likely used as a lure to redirect users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.5755

Heuristics 4

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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://manuscripthandler.com/userfiles/file/13801503148.pdf In PDF document text
- http://mauchlineware.com/html/chapelstreet/web/userfiles/files/19290126216.pdfIn PDF document text
- https://darkoyunpin.com/calisma2/files/uploads/64599982863.pdfIn PDF document text
- https://chilegastronomia.cl/uploads/userfiles/files/23680118566.pdfIn PDF document text
- http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16149caf84d675---nubazolexugop.pdfIn PDF document text
- https://seltec.io/images/uploads/files/1664601201.pdfIn PDF document text
- http://www.themixchange.com/userfiles/files/sopid.pdfIn PDF document text
- http://aiswaryamatrimonials.com/fck_uploads/file/87123979786.pdfIn PDF document text
- http://les-dvorik.ru/userfiles/file/10415776303.pdfIn PDF document text
- https://spheresignal.com/app/webroot/userfiles/files/wukaforaviwenedu.pdfIn PDF document text
- https://www.serwkom.pl/plugins/ckfinder/userfiles/files/42242946431.pdfIn PDF document text
- http://ppogrimall.com/upload/editor_image/file/xupigalezitiliv.pdfIn PDF document text
- https://adikkedua.com/contents/files/radenatiwidupejowosi.pdfIn PDF document text
- http://crystal-lamp.ru/uploads/files/kawexopifewenafaxudi.pdfIn PDF document text
- http://nhuahoanglong.com/luutru/files/wenuwepizokolug.pdfIn PDF document text
- http://hoangnampte.vn/quangbasanpham/app/webroot/upload/image/files/82114447506.pdfIn PDF document text
- https://cplastik.cz/data/cms/file/11424857009.pdfIn PDF document text
- https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3d7785f7d---8703495024.pdfIn PDF document text
- https://oddluzanie.net/userfiles/file/74605707451.pdfIn PDF document text
- http://kyochonbuenapark.iorderfoods.com/uploads/files/80046054688.pdfIn PDF document text
- http://yuqiaohome.com/uploads/files/202109170758532502.pdfIn PDF document text
- http://netmode.net/app/webroot/uploads/files/vabewuvotal.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=truck+simulator+2020+download+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_off0000b367.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB367	17532 bytes
SHA-256: `ca2e466794b52596ae5e5b1a5c1c0c4efcc9aee519451ed79cc35e32b600591a`
`font_01_sfnt_off0000df83.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDF83	11028 bytes
SHA-256: `f4c307780f3557ce4e0c01e965f4057292f1f0652c24ad75a9b30e5bea5b10c6`

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