PDF malware analysis — malicious · a6d202bc93a95c5d

MALICIOUS

PDF

73.8 KB Created: 2021-09-20 09:19:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: cd3b6447b7318121879561bd5e0ed8c6 SHA-1: e9f7302adac275355b626f8eccb74e6145c5f5ea SHA-256: a6d202bc93a95c5d97f272efbd1deb2e8237675cafc6c9a31361a18833aed1e2

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and a link farm heuristic indicates an attempt to distribute or host malicious payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9840

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://medvor.ru/uplcv?utm_term=kingsoft+office+for+android+free+download PDF link annotation
- http://resortcrimea.com/ckfinder/userfiles/files/povala.pdfIn PDF document text
- http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/midadapifugix.pdfIn PDF document text
- https://fsreloading.com/userfiles/files/fewevowupifuripudejuvujib.pdfIn PDF document text
- http://solarhomepage.ch/fckeditor/editor/images/file/60871304907.pdfIn PDF document text
- http://www.poliklinika-hb.cz/userfiles/file/92312769173.pdfIn PDF document text
- http://studiolegalezullo.eu/userfiles/files/5519023269.pdfIn PDF document text
- https://sunnyrosesschool.com/userfiles/file/91840835655.pdfIn PDF document text
- http://jungam21.com/upfiles/file/1630782226.pdfIn PDF document text
- http://duquenne-moteurs.fr/webroot/upload/files/roderifufogumetomerikiroz.pdfIn PDF document text
- https://btsis.com/upload/ckfinder/files/mabinadowonejipuwoz.pdfIn PDF document text
- http://boracayg.com/FileData/ckfinder/files/20210911_C89DA0F0BA18D65C.pdfIn PDF document text
- http://mauchlineware.com/html/chapelstreet/web/userfiles/files/19290126216.pdfIn PDF document text
- http://retailcop.ca/files/85586513209.pdfIn PDF document text
- https://songhongresort.com/img/files/posofonisuganivipozowove.pdfIn PDF document text
- https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/j3ng5qe5itoh6fqpl6snpfv1ca/40160670274.pdfIn PDF document text
- http://jatyn.cn/upfiles/202109/file/1631898254.pdfIn PDF document text
- http://formpart.com/upload/ckfinder/files/61953529778.pdfIn PDF document text
- http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wobot.pdfIn PDF document text
- https://lose-weight.tw/upload/files/69447289811.pdfIn PDF document text
- http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135612e995dc---75355114803.pdfIn PDF document text
- https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/korutameji.pdfIn PDF document text
- http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139da71489f4---betewiragukik.pdfIn PDF document text
- http://kietminhrivet.com/upload/files/43502727342.pdfIn PDF document text
- https://kanat.com/upload/ckfinder/files/guwaduxozas.pdfIn PDF document text
- https://sistemagestiondpr.com/userfiles/file/kodegajakutene.pdfIn PDF document text
- https://www.jnvhardoi.org/ckfinder/userfiles/files/berobawodanaselaruk.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_off0000bfae.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBFAE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d7c5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD7C5	10728 bytes
SHA-256: `bd2009376fda109db895ba6fff43fb5ace59c19994b585b05a302fd9f3661a65`
`font_02_sfnt_off0000f067.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF067	16232 bytes
SHA-256: `599cc9e8567f1169938351e61a84e3a0c7f23086500f5a38719a6f6c90a1a0c0`

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