PDF malware analysis — malicious · 9ef4ce345e23ec10

MALICIOUS

PDF

84.8 KB Created: 2021-09-17 04:04:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 43cd5228d1eb343d4840dfeca0d1b757 SHA-1: 43876382cce74609b9a51e90efd613f6aece112f SHA-256: 9ef4ce345e23ec103732d66c7fa240b5e594ab8ac59eedb014aa7bb2c6742b0f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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=how+to+install+android+application+in+windows+10 PDF link annotation
- https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/c265dd1dd0b1c66c4e0b8165582db92a/puditijaxukilikowad.pdfIn PDF document text
- https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/656b23e814c714eb22e8e5d5ddaa45d5/62218890309.pdfIn PDF document text
- http://ankaraeksioglu.com/resimler/files/punisof.pdfIn PDF document text
- http://lsphc.com/userfiles/file///sejotogerobenodilubivevu.pdfIn PDF document text
- http://tienhasteel.com/app/webroot/upload/files/rotoxarezovepezul.pdfIn PDF document text
- https://resortweeks.pro/userfiles/file/314166823.pdfIn PDF document text
- https://ijtm.in/userfiles/file/98776353147.pdfIn PDF document text
- http://jingyilin.org/uploads/file/54225418999.pdfIn PDF document text
- https://ka-base.no/images_students/files/86845377831.pdfIn PDF document text
- https://ciiinnovationsummit.com/ci/userfiles/files/dujobiduwoziva.pdfIn PDF document text
- http://teifsepahan.com/files/file/6728558471.pdfIn PDF document text
- http://brcassociati.com/userfiles/files/fonezatajerokelawinun.pdfIn PDF document text
- https://rts-wm.com/ckfinder/userfiles/files/vemejogumijixoki.pdfIn PDF document text
- http://autosoftware.company/autoresponders_images/files/dizupadowilulukuwiwetofor.pdfIn PDF document text
- https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/137a3b44737b35eb412e4df3d0dba392/rasexawixod.pdfIn PDF document text
- http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6d329b639---zasafafaro.pdfIn PDF document text
- https://landi-bg.com/images/file/5587225408.pdfIn PDF document text
- http://celeb.huh.hu/UserFiles/File/levimob.pdfIn PDF document text
- http://fratellilongoni.com/userfiles/files/gonirunugidurabemirim.pdfIn PDF document text
- http://bekkercoon.ru/ckfinder/userfiles/files/26566774392.pdfIn PDF document text
- http://ecohouse-lab.com/userfiles/file/43518157093.pdfIn PDF document text
- https://ghnservizi.com/file/fimepu.pdfIn PDF document text
- https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/r17ktvehkatnkgrbg8ls8rlmdm/natonelemamewoda.pdfIn PDF document text
- https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/0f021b41ad1a7fe9fb162d9b898eb148/12520962048.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_off0000e4d1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE4D1	18384 bytes
SHA-256: `2e873a335736736ffe43bb1e1631f829c3e4ed255b83b230bd9e0c6bb7206392`
`font_01_sfnt_off000114af.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x114AF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012cc6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12CC6	10624 bytes
SHA-256: `02d34da852358458bcb49d8b5ed5d9d16aaaf4274f122f5c1e292e78dc7e281d`

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