PDF malware analysis — malicious · 872ff3a681873754

MALICIOUS

PDF

83.2 KB Created: 2021-09-14 15:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 480ef9d7c76746507d3c4f5971dcf31b SHA-1: 730fd113bc1d0c4f5665a1a01311a78c72769244 SHA-256: 872ff3a681873754317e59d602c3a92649d57534bb4d0f4e853231e3e9a791cc

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URLs, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a link farm designed to redirect users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of redirecting users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

Nyx PDF Classifier malicious score 0.9992

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 https://ketchas.ru/uplcv?utm_term=programming+principles+and+practice+using+c%2B%2B+5th+edition+pdf PDF link annotation
- http://4bx.pl/public/file/fafagurixekanizejara.pdfIn PDF document text
- http://firmykominkowe.pl/Obrazki/edytor/file/xuralujunotaveretizexi.pdfIn PDF document text
- http://csaladiegyteruautok.hu/userfiles/files/4592177831.pdfIn PDF document text
- https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d82f541c3d---48834750485.pdfIn PDF document text
- http://daugiavanthienphuoc.com/media/ftp/file/2322982102.pdfIn PDF document text
- http://www.masozilina.sk/ckfinder/userfiles/files/pubisikuwagoxukapeman.pdfIn PDF document text
- http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tidovokerevi.pdfIn PDF document text
- http://jumpstart.mobi/ckfinder/userfiles/files/68685916358.pdfIn PDF document text
- http://rencontres-icare.org/userfiles/file/fonoxiwaxunejav.pdfIn PDF document text
- http://tfforming.ru/d/files/99591394404.pdfIn PDF document text
- https://underworldgear.com/admin/images/fckImg/file/dexivegivox.pdfIn PDF document text
- http://biosite.ru/images/news/file/fuxuvesiseko.pdfIn PDF document text
- https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bead571ce---48457398384.pdfIn PDF document text
- http://hferrynetworks.com/FileData/ckfinder/files/20210909_762D39569BE55703.pdfIn PDF document text
- https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee922c4576---miberepi.pdfIn PDF document text
- https://bepxuyenviet.com/upload/files/75893184523.pdfIn PDF document text
- http://ktai.lmg.jp/upload/file/38728780507.pdfIn PDF document text
- 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_off0000dcbc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDCBC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f4d3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF4D3	11300 bytes
SHA-256: `4bb80ca49f54617f1c6c2262ba133ae26f9cea307ba8774d7c4060259e40afc1`
`font_02_sfnt_off00010f05.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10F05	18376 bytes
SHA-256: `558985a35ad256ec83b6826c67119f0b7a26e735780a7a3d2948752c54949ace`

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