PDF malware analysis — malicious · 25d24bb87440256d

MALICIOUS

PDF

82.5 KB Created: 2021-09-20 04:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 8f74816df3698bed22f1b2ba6190962d SHA-1: 4468adcdb1e9dd4998fcd4b41f21e659c061dcdc SHA-256: 25d24bb87440256d4488e53c53282e4ddbfc2c3592be6a6f21238a27e21d5017

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to disposable hosting or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a phishing or credential harvesting attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

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 http://www.bordadoindustrial.com/ckfinder/userfiles/files/13956939333.pdf In PDF document text
- https://pmms-online.com/assets/file/noliledimanowibegadera.pdfIn PDF document text
- http://wedding-box100.com/uploads/files/202109010552238683.pdfIn PDF document text
- http://autoneza.cz/UserFiles/File/59210393056.pdfIn PDF document text
- http://meetburgerusa.com/uploads/files/mekibolomejawogelovazobuw.pdfIn PDF document text
- https://nevisnews.com/userfiles/sudevak.pdfIn PDF document text
- http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614683a734039---25730702739.pdfIn PDF document text
- http://tiszaikaland.hu/upload/file/68648554364.pdfIn PDF document text
- http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee1ec6f141---95200820296.pdfIn PDF document text
- http://jrecchina.com/ckeditor/ckfinder/userfiles/files/lazadexajuvevorinonap.pdfIn PDF document text
- http://designerhouse.ru/upload/files/86749805705.pdfIn PDF document text
- http://cuspsurgeons.com/userfiles/file/19250455589.pdfIn PDF document text
- https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132445bb686b---jovasejekujaxazus.pdfIn PDF document text
- http://wxbeimei.cn/upload/ckimg/files/202109091106327029.pdfIn PDF document text
- https://comptables-publics.fr/userfiles/file/biludupawudabekovorojudep.pdfIn PDF document text
- https://www.zolmedis.lt/ckfinder/userfiles/files/51587021134.pdfIn PDF document text
- http://suurelepa.ee/data/file/livopoxe.pdfIn PDF document text
- http://eco-versute.com/app/webroot/ckfinder/userfiles/files/zamudeguxudigo.pdfIn PDF document text
- http://thaisomboonautopart.com/userfiles/files/5692636023.pdfIn PDF document text
- https://inprovitparaguay.com/ckfinder/userfiles/files/zarubelisonetaxidutu.pdfIn PDF document text
- https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfd6a4e786.pdfIn PDF document text
- https://tavcam.com/upload/ckfinder/files/sovon.pdfIn PDF document text
- http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16143ead0c9233---728132327.pdfIn PDF document text
- http://jonme.net/ckupload/files/zanudanomafawaz.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=email+365+sign+inPDF 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_off0000dc4e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC4E	18544 bytes
SHA-256: `b4a279f2794a94ce91df02ecd4377a914d3541cc07e1cd4bef1f5af75643ef5d`
`font_01_sfnt_off00010d12.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10D12	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012529.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12529	10456 bytes
SHA-256: `fc490afe73a9a8409c10ebb75e0a9dd6995ebe118488c7c4b7d53573e9a38c95`

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