Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5e486ae1f4a7cff…

MALICIOUS

PDF

95.5 KB Created: 2021-07-22 07:24:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 562111834082cc573f6c34dfcb62acda SHA-1: d31cbbfaf66e36140cfb109440eaaab46eb1f783 SHA-256: e5e486ae1f4a7cff22c4a4dea2fee0956b3895527aa800dc74306a28f6d7e8b6
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of these links suggests an attempt to exploit users by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d4afb06e1---8490147807.pdf In PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/gupikadixojufagu.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608acbd39f7d0---zapemofi.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/bae4sahfec5rtr48cj3ncnqed9/26180064733.pdfIn PDF document text
    • https://carlojans.com/cms/file/54203202668.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a186545e5aa---zewawize.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/77418496041.pdfIn PDF document text
    • http://amandamaitland.com/images/file/muwenovisu.pdfIn PDF document text
    • http://kanstm.com/ckupload/files/pujafap.pdfIn PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/93309558902.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/58376245527.pdfIn PDF document text
    • http://lawngo.net/fckfiles/revuxex.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/cbcf80758beb38572505806349fecb38/80324761025.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/57170812783.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084351e9aabc---viragonu.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/zozeteku.pdfIn PDF document text
    • http://sns.hu/_user/file/90187616423.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/ramabupotekimulita.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/vhpjdb9u281iaii5c0heab4pk3/jotijixo.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/716a0bc1014c71d8ffc5b330055bfabe/magebamipogefabixuxarodes.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/gfl5uh5lbvhmkto1ft3thp93uk/mubofowi.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607090d39879a---jasutuwusuma.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/6pterns6mo6t6mq9kega5rs2g2/jujoropuvajogotiwedol.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/11755860978.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/samip.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/cd2d4964011f08df1ae483b102df84fa/giremomad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=michigan+report+from+hellPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F14 10752 bytes
SHA-256: 0e802f32e420bfb67f92acce676901562b0f4e6ce6180b4168547e9648a6f020
font_02_sfnt_off00013798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13798 2868 bytes
SHA-256: e2c4d7afc0c1bed4e6008737906b1db8cf7964d12ae5e4968cea19a0725bc110
font_03_sfnt_off000143b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143B4 17152 bytes
SHA-256: 96ebef62845191a9feb25c733dfe3658419bfaf17b08499f848e88567007784a