PDF malware analysis — malicious · 594f0cfa6f8852ac

MALICIOUS

PDF

80.9 KB Created: 2021-09-06 20:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 293ed4833fc9f676d04278d9d9aa8060 SHA-1: 4ec16d52333cbc1b0d891713a1f9bb7dde6550e7 SHA-256: 594f0cfa6f8852ac64fc8f9ab30f1b5985859d37baed4471169339eb51f1ade9

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt, likely leveraging spearphishing attachments as the initial access vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9911

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 http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/56997509363.pdf In PDF document text
- http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e1be7526e---4775704403.pdfIn PDF document text
- http://insuralead.com/userfiles/file/2020435053.pdfIn PDF document text
- http://ildongwire.com/userfiles/file/56083785059.pdfIn PDF document text
- http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210528030204.pdfIn PDF document text
- https://arerp.kr/data/file///rawiwenugudiwutipaba.pdfIn PDF document text
- http://amdind.com/userfiles/file/borerisujeje.pdfIn PDF document text
- http://deurenhanger.nl/userfiles/file/tibonebugurusubinuron.pdfIn PDF document text
- http://fitviewer.biz/files/file/lusewexef.pdfIn PDF document text
- http://ed-web.cz/userfilesfile/73573032832.pdfIn PDF document text
- http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c65ba32a190---melajaxuw.pdfIn PDF document text
- https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/3705e4c7429520fc5acab062c9986a2c/9722915606.pdfIn PDF document text
- http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3b9f0e7bd---pobetivefolukasagubi.pdfIn PDF document text
- http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbefaff420e---pugugawesujowi.pdfIn PDF document text
- http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/b373cd560d9bc86bf12efa94d325df78/95232280578.pdfIn PDF document text
- http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607244329e8d7---jofepe.pdfIn PDF document text
- http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/kuzobipedusiriboduk.pdfIn PDF document text
- https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/e979lf3olkse7j46cv6cb31kpu/zekudelanukusumosaxa.pdfIn PDF document text
- https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0cfb58b9b---88074740935.pdfIn PDF document text
- https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609adc9c96ccb---sumaroribop.pdfIn PDF document text
- https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/g2mnej2d0j1pq7f7jh9g2t3mqr/sepinotomibofedajod.pdfIn PDF document text
- https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d19d9f1fe1b---35530345311.pdfIn PDF document text
- https://study-abroad-travel.com/ckfinder/userfiles/file/rolutimotoxaxotazu.pdfIn PDF document text
- https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc53986dd4---jiradamofa.pdfIn PDF document text
- http://www.phuongdonggolf.vn/app/webroot/uploads/files/rifologowesajedewulugij.pdfIn PDF document text
- https://strategie-forex.com/ckfinder/userfiles/files/kururake.pdfIn PDF document text
- https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750ed3ab932---82066871887.pdfIn PDF document text
- http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ba6c44308bd---desokapetujafavoxe.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=language+barriers+in+the+workplace+pdfPDF link annotation
- 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_off0000d65e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD65E	17164 bytes
SHA-256: `ac9c9e5abd58314d12b4bdef02b4b1ef5dc42fe71f82a96616a9f8e8fdac2c6a`
`font_01_sfnt_off00010319.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10319	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011b30.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11B30	11276 bytes
SHA-256: `d7e74a8ab8921ade9a4ffa3addf6deea1c4d327bfebeaa502576860f042635da`

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