Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6e135c58d286eff…

MALICIOUS

PDF

80.7 KB Created: 2021-09-21 06:07:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d85e8f68a5929ec624b616010ed2f13c SHA-1: c507d6f08b8953410c8db0da5e7b6fee670a2fa4 SHA-256: f6e135c58d286effd64cd457694c07dc429da19ed086e1a05c8aea846106c0ef
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document is classified as malicious by ML models and ClamAV, exhibiting characteristics of a phishing lure for remote support tools. It contains numerous links to disposable hosting and compromised CMS uploads, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a likely intent to exploit user trust for the download and execution of potentially harmful software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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=android+connect+to+pc+software PDF link annotation
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/16a181dce1e607bbd7f488f389d71fc8/fisowubudaxod.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/43066467582.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/6b29718dba22ad46d0aba2f65501ba05/javubakije.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/60194139013.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/46704916913.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/vumetagenotasovofez.pdfIn PDF document text
    • https://olterus.com/contents/files/velepexodigezipalu.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/xozaligasud.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/09/file/202109121236163781.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161401c7138f91---20006813733.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/d0b823d3c0aeb45bd1adb865f948f8cf/14976914334.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/tebukivovez.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/44561161037.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/gudazopuzurekepirewano.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/bumikavewepiwim.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/kegarimapenitubutakex.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/jokuw.pdfIn PDF document text
    • http://finchamauto.com/pics/mejegox.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/43710412731.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/fuviwajozagabe.pdfIn PDF document text
    • https://ccvt.vinaonegroup.net/upload/files/42246506107.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/72982387203.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/70126621132.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/67399632587.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_off0000d74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74F 10636 bytes
SHA-256: 1e6c4a6d46fe20da545121a542e0836e5ca343eff9e28b587233f9e857f7151f
font_01_sfnt_off0000efdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDD 17536 bytes
SHA-256: c85672c582ab6b98bfe77d31cc9a7889e49569b84c2b4bae2a84b18778570604
font_02_sfnt_off00011cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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