PDF malware analysis — malicious · f7be6768c396ca4a

MALICIOUS

PDF

82.5 KB Created: 2021-10-07 20:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: 4693a233caa6f3cf2af9905daa9ce4c6 SHA-1: 3f00f25c51cc417d267fe9ad8bd2a0a8bdeca743 SHA-256: f7be6768c396ca4a313d413fcaf1d3e4cede4e0f58e12456ea8a09e292205048

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to disposable hosting or compromised CMS uploads, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the nature of the links and the detection suggest the PDF is designed to redirect users to malicious sites, potentially for further payload delivery.

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 https://chcial.ru/uplcv?utm_term=principles+and+practice+of+psychiatric+nursing+pdf+free PDF link annotation
- http://belean.pl/userfiles/file/xumexebanovobebadafo.pdfIn PDF document text
- https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/7f5e2831b6f9b016e018f5b472417468/nasawuraj.pdfIn PDF document text
- http://rallyteamwalraven.nl/file/86523451872.pdfIn PDF document text
- https://suacuacuontoanphat.com/upload/files/kisubuzejujopiworevesoxit.pdfIn PDF document text
- http://xn--q20b13r9leepaeb.net/upload/file/202109091207489583.pdfIn PDF document text
- https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615890a22913e---6945524210.pdfIn PDF document text
- http://easy-sleep24.de/shop/images/editorfiles/file/ziburujojavamadever.pdfIn PDF document text
- http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614f7c930878f---tofopumagegijisugelonisa.pdfIn PDF document text
- http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/161528ce10f038---fagemaratelirupelutetupi.pdfIn PDF document text
- https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/db241h9bpeo4e5jithrs2bk0n6/27014252581.pdfIn PDF document text
- https://lp-tracking.com/userfiles/file/65370397991.pdfIn PDF document text
- http://jan-fotografie.nl/upload/files/mepazizesuno.pdfIn PDF document text
- http://restavratorstvo.com/ckfinder/userfiles/files/59244950.pdfIn PDF document text
- https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/38316114578.pdfIn PDF document text
- https://mimpiindahsatu.com/contents/files/83411652830.pdfIn PDF document text
- https://etevent.itweald.com/uploads/files/612f09006f25b.pdfIn PDF document text
- http://vaonhaphatphap.com/images/uploads/files/vekusovefovutoxug.pdfIn PDF document text
- http://halongwave.com/userfiles/file/komizifaminezitisesemo.pdfIn PDF document text
- https://fototipia.hu/files/files/48657700042.pdfIn PDF document text
- http://bellina.pl/userfiles/file/39368953283.pdfIn PDF document text
- http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/damaped.pdfIn PDF document text
- http://slstudio.it/userfiles/files/34749556583.pdfIn PDF document text
- https://ismart99.net/upload/files/73800631033.pdfIn PDF document text
- http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f795bea554---bezuriruweranive.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_off0000dbfb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDBFB	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f412.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF412	11116 bytes
SHA-256: `e49870cf22c667590ed7e9ff8fc2a8919a870b63054bdb13bc17f0bb90869c8d`
`font_02_sfnt_off00010dbb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10DBB	17788 bytes
SHA-256: `870415379c5bc22e12df535939199fb20e41348c1e5b2d5364793e21381fbd34`

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