Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e628f43ae2e19f3…

MALICIOUS

PDF

84.4 KB Created: 2021-09-09 12:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b5630defa269cdc86e450bd7652a8211 SHA-1: 517a6a4b60cec3601b553c732da586715a437013 SHA-256: 0e628f43ae2e19f346b9ad858e089d035dc69e2b25d78301ae2d43ef7743362b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or malware distribution. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely provides a password to decrypt a malicious archive, a technique to evade security filters. ClamAV also detected it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://ketchas.ru/uplcv?utm_term=zaobao+android+app PDF link annotation
    • http://wolfpackbasketballacademy.com/content_docs/88145082803.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16309867722989.pdfIn PDF document text
    • http://upakuika.com/img/file/32352318694.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/bevamimikopipugozakamuma.pdfIn PDF document text
    • http://esistore.com/userfiles/file/mujuf.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/t5hjgj3gigauss5nv0tckirqb5/12729185662.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/denuxamerorojemejitina.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/49046382245.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/kiriz.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/fikunuwobemize.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/58728160.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/xolejagidagakugisiwakura.pdfIn PDF document text
    • http://coolbiotech.com/upload/files/42579877032.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///56878334044.pdfIn PDF document text
    • http://dmkert.hu/files/file/15752119107.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/1628771096.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/54193021195.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132736af39fa---92023301773.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613692230b24f---31403828146.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/10200384592.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/mejevevapivupaxovud.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/pepifudasumap.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/pagisebawipijozanejudo.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/vefinitumeki.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_off0000e5c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD5 18136 bytes
SHA-256: baf07e7fdf203073c21b855a68e0cd52cac1d3dba7f9e1acd4083736350e1656
font_02_sfnt_off00012e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E24 10044 bytes
SHA-256: 3452efaa65a96bcd44afed07e5f6823f31a22567d0257a0d3178b8943797fb64

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