PDF malware analysis — malicious · 3a9ac3d7df39ef4d

MALICIOUS

PDF

73.2 KB Created: 2021-09-20 05:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 99e30b59b5e5a3c423b0985058e88f96 SHA-1: d6b4e55081704720ba9bff4499fd7f80aa45a5c0 SHA-256: 3a9ac3d7df39ef4d19d0eca7e844ae2868c395fd7269c1bbfa3b48130ba8923d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute phishing content or malware. No scripts were extracted, but the presence of external URIs indicates an attempt to redirect the user to malicious content.

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://ketchas.ru/uplcv?utm_term=nature+sky+wallpaper PDF link annotation
- https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/17f3d70f5eddcf88b6b9a73b469ee8c2/92991623478.pdfIn PDF document text
- http://csc0535.com/userfiles/file/20210911061402_0bmkw9.pdfIn PDF document text
- https://sealordhotels.com/ckfinder/userfiles/files/64863259323.pdfIn PDF document text
- https://stepweystudy.com/ckfinder/userfiles/files/99626015291.pdfIn PDF document text
- https://ashasuchikala.com/ckfinder/userfiles/files/kidupazesubepidilugafabi.pdfIn PDF document text
- https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/0b0360b30ed09f1bf8b6dbf2709db050/3051023476.pdfIn PDF document text
- http://ticketsperiodico.com/galeria/files/fodorugekatumidajalobisad.pdfIn PDF document text
- https://ukmalayalamnews.com/userfiles/file/27959309659.pdfIn PDF document text
- http://magiepourenfants.com/images/mediamanager/file/69820419391.pdfIn PDF document text
- http://avtokapriz42.ru/userfiles/file/ditatefagerudanari.pdfIn PDF document text
- https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/27901948709.pdfIn PDF document text
- https://loonbedrijfschimmel.nl/userfiles/files/boxukisuzekoxigenalovibe.pdfIn PDF document text
- http://wuyioutdoor.com/userfiles/file/71532791534.pdfIn PDF document text
- https://bazk.info/public_htmluploads/file/jivanumigevovatuse.pdfIn PDF document text
- https://moyaexpresss.com/ckfinder/userfiles/files/40918803242.pdfIn PDF document text
- http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161359de1692fa---92429681889.pdfIn PDF document text
- http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614111bbe667a---kujepepideruzepoxuge.pdfIn PDF document text
- http://advairtech.eu/assets/userfiles/file/notugepegep.pdfIn PDF document text
- https://sambelteri.com/contents/files/sapiwapamewofesegipa.pdfIn PDF document text
- http://giorgimpianti.com/userfiles/file/pibiba.pdfIn PDF document text
- http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d3a7e22bd---bojerewaveriwovo.pdfIn PDF document text
- http://riph.pl/userfiles/file/62217714234.pdfIn PDF document text
- http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210917_8F4E1F606B65DE8E.pdfIn PDF document text
- https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/id6hdq7t807lska84spdkrdgb2/livifabavawarowo.pdfIn PDF document text
- https://hoatuoi360.vn/uploads/files/senibiso.pdfIn PDF document text
- https://sunpower.lv/ckfinder/userfiles/files/29798628836.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_off0000bd7b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBD7B	10300 bytes
SHA-256: `e6fe271b20338d9b82d529d2622a5aca0009e4d07db7b9119106235b33a5add9`
`font_01_sfnt_off0000d501.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD501	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000ed13.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED13	16452 bytes
SHA-256: `ac522a2cfbbf2db0b5f0901cb92fe2e74ec711383219581f89f90e3cd5a58812`

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