PDF malware analysis — malicious · 4f39279787f3029e

MALICIOUS

PDF

62.3 KB Created: 2021-09-20 15:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: c149658401b54f5b81287c20d13b38b9 SHA-1: 0876f4ffce0dd4fc2ca887bc28a86819b43d29b9 SHA-256: 4f39279787f3029efecb45bf117ce647639b95a0b7f926a56a86018f4bad326b

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and the nature of the link farm heuristics strongly suggest this document is designed to lead users to potentially harmful websites.

Machine Learning

Nyx PDF Classifier malicious score 0.5920

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://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/7e3e7a824fd76a002818300f3ad6de9a/kopop.pdf In PDF document text
- https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/01e5c175972b8b33a4a549c76e6bfe60/65072978132.pdfIn PDF document text
- http://woori-tour.kr/FileData/ckfinder/files/20210914_9C485DA6D26D0940.pdfIn PDF document text
- http://rbtyutj01.com/userfiles/files/81559477313.pdfIn PDF document text
- http://anhuifan.com/upload_fck/file/2021-9-2/20210902204825132397.pdfIn PDF document text
- https://biocoils.com/img/file/bojoduvaxinijigodedaza.pdfIn PDF document text
- http://langmypham.com/luutru/files/39688905932.pdfIn PDF document text
- http://inggeo.eu/userfiles/files/3717162082.pdfIn PDF document text
- http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/kodibarovip.pdfIn PDF document text
- https://evermoral.hk/upload/file/1630835231.pdfIn PDF document text
- https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/gosiwovotoburutivakejul.pdfIn PDF document text
- http://bodemveenweiden.nl/bodem-veenweiden-img/48549899728.pdfIn PDF document text
- http://vivatbacchus.hu/files/file/julewafolafumo.pdfIn PDF document text
- http://gz-chengeng.com/uploadfile/files/10047239361.pdfIn PDF document text
- https://llbyggodesign.se/UserFiles/files/pipuvapalexozef.pdfIn PDF document text
- http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e18566f5dd---43370239070.pdfIn PDF document text
- http://www.papelerialapiceros.es/ckfinder/userfiles/files/86477181700.pdfIn PDF document text
- http://tecs4.com/intranet/ckfinder/userfiles/files/66686496730.pdfIn PDF document text
- http://salt17.com/userfiles/files/mugogo.pdfIn PDF document text
- http://railwaysrailroads.com/upload_files/files/watovama.pdfIn PDF document text
- http://ayhancevik.com/images_upload/files/zevad.pdfIn PDF document text
- http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613271f51c020---mabafunadunelem.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=malayalam+movie+mp3+songs+free+download+320kbpsPDF 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_off0000c581.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC581	11648 bytes
SHA-256: `e7a3149c087499b106c3923ae6628c07bea0ae7d81700d247657ec49c585d944`
`font_01_sfnt_off0000e0e2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE0E2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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