Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cbd67b7ec3cb88e…

MALICIOUS

PDF

87.7 KB Created: 2021-07-03 23:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: cc380545439be20c518f5b97a705ed9e SHA-1: 28a1d3d522dda485538ca4336e0d0096f23c0607 SHA-256: 8cbd67b7ec3cb88e1dcb52308cef2b43abadc1b95f1b9e27accab26283bd0305
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1555.003 Credentials from Password Stores

This PDF document is identified as a credential harvesting lure, specifically targeting multi-factor authentication or one-time codes. The document contains numerous links, many hosted on compromised WordPress sites, which likely serve as landing pages for the phishing attempt. While no scripts were directly extracted, the nature of the lure and the presence of multiple external links suggest an attempt to trick users into divulging sensitive authentication information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/ffefc7fd3c99f7e8d89e6b01e0b3ae74/bajug.pdf In PDF document text
    • http://novichiha.ru/pic/file/vovovibosozipabipape.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/3c713c4ddb369811264f5b7c67bf0a96/95483941530.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/megaxutidogatije.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f4a274b15---bomajuj.pdfIn PDF document text
    • http://quaker1960.com/clients/3/34/346d0055920ff30d27c63167e405b0e7/File/1110568538.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/jefolufozanor.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/86mcpe1edbqpksk1dv1c5f1c42/releporisa.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/59681369942.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a2de6d4e007---4680716634.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c13ede88b1a---kojabaxexolude.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c4df1c11b---7991553064.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/b0kef2f62m99ac24d3cpnn3v2i/33259849796.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/r2d88v4369db1umlkgr5tpg3cf/jakegukemojaluzinodare.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160e094ce5c376---fupufavufuwasixuwe.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/xonafetusopelunupeva.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecf8f8b2e5---ledagujizatowujagidoj.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081c1b7d7cbc---fowexokasakuwoj.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/76680248509.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608922cce01a6---24246160210.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/24543237648.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/60199420028.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=goblet+cell+metaplasia+esophagus+icd+10PDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF380 11212 bytes
SHA-256: 4103794ddd49cbd9f107b17165a714028491912d57ee12040014d5b8a70fc9f0
font_01_sfnt_off00010d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5A 17104 bytes
SHA-256: a3d95d04bff935e603b9499d05257b6eb9c52d45f5ccd5a0e75fa0f13c67e4ca
font_02_sfnt_off00013983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13983 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1