PDF malware analysis — malicious · da5730a21fc117e3

MALICIOUS

PDF

79.6 KB Created: 2021-09-18 15:36:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 7efcd5a139781a5aa03b315739e37816 SHA-1: 960a1e061cea8a1abff2920ac3fac8100e61ef81 SHA-256: da5730a21fc117e3bbe4a6146ebcf9c2e3bd43c3f12629cda5c7a17d23b39ead

124 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple embedded URLs point to potentially malicious domains, suggesting an attempt to redirect users to phishing or malware hosting sites. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to exploit users.

Machine Learning

Nyx PDF Classifier malicious score 0.6964

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 http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1612fafb593afd---13710738499.pdf In PDF document text
- https://ecowaytechnologies.com/ckfinder/userfiles/files/wagalisivopifolufifokixi.pdfIn PDF document text
- https://anjingliar2.com/contents/files/95694679241.pdfIn PDF document text
- http://ulsantour.com/FileData/ckfinder/files/20210913_299396888BBFB4A1.pdfIn PDF document text
- http://studiotecnicopetrillo.eu/userfiles/files/selujogifigesor.pdfIn PDF document text
- https://www.hippocratio.gr/ckfinder/userfiles/files/60865706862.pdfIn PDF document text
- https://lifesmart.ro/ckfinder/userfiles/files/gelurox.pdfIn PDF document text
- http://space-edge.com/upload/files/kofuvidagaruxafeli.pdfIn PDF document text
- http://nguoiquangphianam.com/uploads/files/romolepuw.pdfIn PDF document text
- http://pass38.com/images/contentimages/files/xuteju.pdfIn PDF document text
- https://endeligmandag.no/e-brev/data/div/mojodofojapolejetu.pdfIn PDF document text
- http://brukbet.com/user_images/file/23696892714.pdfIn PDF document text
- http://cokhihoaiduc.com/uploads/files/36849523242.pdfIn PDF document text
- https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/kotumanimuw.pdfIn PDF document text
- http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16132f569316ff---gunabe.pdfIn PDF document text
- http://meghdoothsuzuki.com/uploads/sepilimikigarotareda.pdfIn PDF document text
- https://plentis.eu/ckfinder/userfiles/files/bogipes.pdfIn PDF document text
- http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613aea3465f0b---kenatikagez.pdfIn PDF document text
- http://davcpundri.com/css/file/90809272376.pdfIn PDF document text
- http://www.sushmitamukherjee.com/fckimages/file/75802637825.pdfIn PDF document text
- http://kfnmsz.com/upfolder/e/files/20210908035705.pdfIn PDF document text
- https://sua.vn/uploads/userfiles/file/muxivan.pdfIn PDF document text
- http://batistar.fr/userfiles/file/nekuluwa.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+send+a+picture+from+android+phonePDF link annotation
- 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_off0000e232.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE232	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000fa49.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA49	11016 bytes
SHA-256: `effaf6ca1e0aa7a713ec182be79183e4880026ce840d9dff6d5cd84d3dd97c07`
`font_02_sfnt_off000113ba.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x113BA	18252 bytes
SHA-256: `1bb94321ce830e3f2438cc68a16b0c43d776bf8b9b8cac4c24abbcdb5c65513f`

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