Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fe493356776d928…

MALICIOUS

PDF

86.9 KB Created: 2021-09-01 23:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 44d5938b740051dd69c9f019c9914a94 SHA-1: f9316247505074665bc1e8e92a899f9f1f862551 SHA-256: 6fe493356776d9280caccf311c57c8c7ec66c554415231bd5fb0207c91b82d2a
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains multiple heuristics indicating it is a link farm and a lure for remote support tools. The presence of a 'download button' lure and instructions to install remote support software suggest the document aims to trick the user into downloading and potentially executing malicious software or granting unauthorized access. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=revit+2018+free+download+with+crack PDF link annotation
    • http://levne-pohary.cz/UserFiles/File/16302250629.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/lqsoosbbhr1o5erdmesum868l4/87661075587.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/17701597871.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/rulejusidotinevinirisi.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/gepibisovapobenike.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2df504bcf4.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/tepuxozoxudarib.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cc35d3991---vinodi.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/93493016286.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/kabedexatozodaxot.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/81575249671.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/62960828199.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/95385241991.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210731071956.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/24254841301.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c44ac9e0614---6913574362.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/94494830076.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/lebegisak.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/gizaxotumufidawelupem.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/zinegizerexudew.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/vedimubiduzupiribobub.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161154b0737176---venod.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/coe64l68ccgo0ub7pfqjfscr04/11859156768.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/37381830440.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_off0000e9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E8 17868 bytes
SHA-256: 27f6c7f0ab913a71d15d297f48883bab6467d5c2695d1538f090487ce36f4ec4
font_02_sfnt_off0001308a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1308A 11196 bytes
SHA-256: f94502efd35149107ad312d51b94eb4c62a8e89b945d8ff523294bccbf894cc6

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