Malicious PDF — malware analysis report

Static analysis result for SHA-256 edf77d779ea39396…

MALICIOUS

PDF

86.0 KB Created: 2021-09-20 15:35:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0766e4ff4f14eee8f9a5f98c3bf92249 SHA-1: d01bb5e7c737a8a840445abef21bc2d9f8fe4a2e SHA-256: edf77d779ea3939696f4e231428490ce487c1288258e1532b9d9769264a8b1e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=3c+battery+monitor+widget+pro+apk PDF link annotation
    • https://derya.afmiletisimajansi.info/resimler/files/65192661566.pdfIn PDF document text
    • http://grasslandtj.com/upload/files/39725795529.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/pusopoxamefenu.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/95337752858.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb59321bed---57729766865.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/gegatuwono.pdfIn PDF document text
    • https://raguvosbaldai.manovonia.lt/images/files/57260888942.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/guzun.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/zajazoti.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d88ed24ac---zorozuzebuluzolavi.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/ripopuk.pdfIn PDF document text
    • http://amdind.com/userfiles/file/36162657878.pdfIn PDF document text
    • http://www.celso.org/download/kulusirobuxu.pdfIn PDF document text
    • https://hmradiatoriai.lt/images/files/boledepujid.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/514b1b218f1d52039afccb825050e770/50840703349.pdfIn PDF document text
    • http://rotang.net/userfiles/file/57056730646.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/zitowotixikofixodu.pdfIn PDF document text
    • https://festacontinua.it/public/file/nodibu.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/29034534383.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/64199363862.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/c7imuksl0q233i1p9etci7rimk/60710201658.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/zelesupofixupugomobegajod.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16141bdadd2bd9---53948325845.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/88214797982.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/28762077987.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_off0000e118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE118 20900 bytes
SHA-256: 525179ed654e2dea9f698aa5b8c75c0d3fb8fe892e4e2fb05e362a9a289d3da0
font_01_sfnt_off00011830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11830 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13047 11148 bytes
SHA-256: bc2faa497709d942d84a2d7a59ee0a65d965614d8f906cf9dbf7d1e0b8a11dff

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