PDF malware analysis — malicious · 901ea7b2064192ba

MALICIOUS

PDF

87.6 KB Created: 2021-07-03 10:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: b25cca7a1abe7b1b03565f4b615deb0f SHA-1: 37e89d464f679a01811fb76349dd75b9e08dd797 SHA-256: 901ea7b2064192ba2bf28625075057e65128fc569616e577cacdaec1738f687a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

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 external links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate a likely intent to redirect users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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=scr+is+a+bidirectional+device PDF link annotation
- https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/492b09690efb6a5eb120c7f5eca7bbed/53710425879.pdfIn PDF document text
- https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f71e7d171d---sesagunamenawilusu.pdfIn PDF document text
- http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160896fbfa3db5---66255292263.pdfIn PDF document text
- https://istanajp2.com/contents//files/81165736496.pdfIn PDF document text
- https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/odmkmnp7ne59aqe4ojuimrudq3/kinaxunuzojazapabafiguwip.pdfIn PDF document text
- http://r2doodles.com/clients/4/4a/4a4ed909dcef54c1e3ec6a0ce1d29f2d/File/2157136506.pdfIn PDF document text
- http://golden-candies.ru/webroot/files/files/pozotaj.pdfIn PDF document text
- https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/dbcfcb43af614b8c6ec359c1defc595a/29491454595.pdfIn PDF document text
- http://aromaonly1.com/yamituki-n/uploads/files/gediwas.pdfIn PDF document text
- https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/051071a891f0632e2b033cd8bd495467/xitida.pdfIn PDF document text
- http://hyosangjo.com/userfiles/file/20210624094237.pdfIn PDF document text
- https://liderpin.com/calisma2/files/uploads/zuxad.pdfIn PDF document text
- https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/04152fa5dc63456ad2901f7b57bb9eba/nurunabugamozom.pdfIn PDF document text
- http://goteneplast.se/files/images/file/30101313536.pdfIn PDF document text
- http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d363eb074---misefiloxubiputafufovexi.pdfIn PDF document text
- https://noithatkuongthinh.com/uploads/files/kowunefemibadomigin.pdfIn PDF document text
- http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d63779687e---40236556385.pdfIn PDF document text
- http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074f99d369a9---rutewafud.pdfIn PDF document text
- https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16071ae26124fc---bixodinakimaginidosirij.pdfIn PDF document text
- http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16099e8e397868---76590489850.pdfIn PDF document text
- https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/094d0b26039692d5e71f6913921ad2ae/97343355948.pdfIn PDF document text
- http://montaze.org/democms/userfiles/file/tegekimuxef.pdfIn PDF document text
- https://atl-50.com/files/file/nifiboluwebexesafifoba.pdfIn PDF document text
- http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be4f1a0464e---fuxiwanepitaveleka.pdfIn PDF document text
- http://vankouwenenmastop.nl/UserFiles/file/bebejogi.pdfIn PDF document text
- https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/c724d420b090c33105b7e57894ec761b/bijisapevusedimiwosojuguz.pdfIn PDF document text
- https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/6ad14de88821bbcdf3066068a32e468f/jorivavukuri.pdfIn PDF document text
- http://ip-golubev.ru/ckfinder/userfiles/files/67069511202.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_off0000f2a4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF2A4	10644 bytes
SHA-256: `4cb7606d5654bc1bf61d975390e3c0170153ba21e7bb583a63832ebed6eed58e`
`font_01_sfnt_off00010b1a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10B1A	17384 bytes
SHA-256: `989478480bff53233edda1c09795995c86c353304ca5cedb8b1e2a645f4ffbba`
`font_02_sfnt_off000138c1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x138C1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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