Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6fd864fc6be1b13…

MALICIOUS

PDF

73.0 KB Created: 2021-09-27 04:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c5ae018ac089f2b6dec7f58507b4d5e5 SHA-1: 508158ff6db4dd316fde3257b9d64c3ccf8a5bd8 SHA-256: d6fd864fc6be1b134b671224eaa9a73461b1b5cbaceaf17f6eac79e81f014f5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised websites or link farms. Heuristics indicate that these links are used to distribute malicious content or conduct phishing operations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://inwebjor.ru/uplcv?utm_term=android+web+developer+tools PDF link annotation
    • http://i-harmonics.com/upload/files/zeletinidiwarine.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/15262688582.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/41836369400.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161365a3863014---54713150.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/teluzalaberoxovesufezat.pdfIn PDF document text
    • http://giahung.tincorner.com/uploads/files/bajamubal.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/q02ve6acki8uma51egs0d8itlm/pubakurofitug.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/43703836629.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/64848158804.pdfIn PDF document text
    • https://somos.co/dleyes/admin/fotos/file/11735141186.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/776807314.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614c2b8ad5991---ditoderobamafale.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/52777494812.pdfIn PDF document text
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/wodofaroverimapuwagodesi.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/94621515984.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/74053349977.pdfIn PDF document text
    • https://wildnaturetravel.com/File/74697609357.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/8980790878.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/jazininorogoveb.pdfIn PDF document text
    • http://hanyuchina.com/upload/files/wodawelasodudamarubig.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/duxeboxegonuxadoxa.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/22650666018.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/70273328406.pdfIn PDF document text
    • https://urbanshapes.in/userfiles/file/5147815481.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/24115087385.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/41e342faee6e97f2c31a3857019e8de1/63784046901.pdfIn PDF document text
    • http://fencefactoryny.com/userfiles/file/59352800772.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.

FilenameKindSourceSize
font_00_sfnt_off0000b97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB97F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD191 17624 bytes
SHA-256: 7998b07433207db75e57f15d17f0b4d76511da59e625443f466d2a561c1a4e25
font_02_sfnt_off0000fe41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE41 10496 bytes
SHA-256: 62be8790cf4264ef75c4356fcd9e50dab00c2545373dd0fcac3d7decb9c08881