PDF malware analysis — malicious · 58fb7002872a43cc

MALICIOUS

PDF

82.7 KB Created: 2021-09-10 05:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 7169e2c74db06057569e3b86b7de232c SHA-1: 66885cd18f067c18e50c1516ee71a8052b78de72 SHA-256: 58fb7002872a43ccb1e34b9ea85cb2c58408157e9e7ce68a36a22d8b3296ccf8

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to PDF files on various domains, suggesting a link farm or redirection mechanism. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating the PDF is designed to host many links on disposable hosting. The primary attack pattern is likely spearphishing attachment, leading users to these external sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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
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://whiteplacard.com/UserFiles/file/60099213443.pdf In PDF document text
- http://www.alexgis.com/siteuploads/editorimg/file/23072918697.pdfIn PDF document text
- https://kasihpaham.com/contents/files/72370263768.pdfIn PDF document text
- http://portaldeaquidauana.com.br/ckfinder/userfiles/files/delasir.pdfIn PDF document text
- https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16138742146383---68190734075.pdfIn PDF document text
- http://hitplus.eu/userfiles/file/18760010839.pdfIn PDF document text
- https://sarenpinler.com/calisma2/files/uploads/wemudixofuwolavufedusaxog.pdfIn PDF document text
- http://ingmontagna.com/userfiles/files/33559930773.pdfIn PDF document text
- https://stallion-international.com/userfiles/file/19642343891.pdfIn PDF document text
- https://brtim.com/uploads/wysiwyg/files/783681269.pdfIn PDF document text
- https://cortopolis.ar/userfiles/file/45914637655.pdfIn PDF document text
- https://all-new-wow.com/upload/files/fepikudonokesavidem.pdfIn PDF document text
- https://foodexgida.com/uploads/files/novuxiwififudomuzilevale.pdfIn PDF document text
- https://mlbcsimleague.com/ckfinder/userfiles/files/rejawesejapojonazari.pdfIn PDF document text
- https://safe-international.com/userfiles/file/99848294001.pdfIn PDF document text
- http://htbestcomputer.com/media/ftp/file/zemukaz.pdfIn PDF document text
- https://nezrenpin.com/calisma2/files/uploads/rogemuxikaputagejipuweno.pdfIn PDF document text
- https://quimicasorocolor.com.ve/ckfinder/userfiles/files/sakavimujasavetete.pdfIn PDF document text
- https://hotararicedo.ro/files/files/46369441110.pdfIn PDF document text
- http://www.parinet.fi/tiedostot/files/49745816905.pdfIn PDF document text
- http://omeofest.eu/userfiles/files/rudebakotinujitezovaj.pdfIn PDF document text
- http://vietnam-intraco.com/webroot/img/files/vedirevimomuxujabegizi.pdfIn PDF document text
- http://ciaomamma.hu/editor_up/wosotabiku.pdfIn PDF document text
- http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16135c8434d21c---fibakixaxebesanalag.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=10th+class+geometry+book+pdfPDF 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_off0000d87a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD87A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f08c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF08C	19268 bytes
SHA-256: `8406edf4553ed7059771f622c3802cbf7f9a0e8bcb083496e05c64c339a28cd0`
`font_02_sfnt_off00012318.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12318	11292 bytes
SHA-256: `a63c74c9b0d40a69ce6068c9493d0afe315e48eb46d7625df95190fc997fd5b8`

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