Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d8a9018bcce23a3…

MALICIOUS

PDF

76.1 KB Created: 2021-09-03 16:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4ad9b29e26b6a4acc62ce5137000785a SHA-1: d071736237632fd3d52d42500066e1bfdff094ce SHA-256: 1d8a9018bcce23a3faf62960e1195e10b953eb0662a4f45b30011ff70be23672
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple disposable domains, a common tactic for distributing malicious payloads. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download an archive and provides a password, a method to bypass gateway scanning. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to facilitate the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://daks-96.com/f/uploads/files/kopigiwavimesaxaxe.pdf In PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a785262589e---xozis.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/novavevezukazodigor.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/susuvogatigeseseselajawad.pdfIn PDF document text
    • http://veitali.com/upload/files/febarerir.pdfIn PDF document text
    • http://huron81reunion.com/clients/f/fe/feec28e48c841af8be4ad6373737a022/File/50642638758.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/duwirorokegiwidusaguba.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/bf28ccf8da9e204d3b63dad72a6e986b/forejusun.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b10f67f1f---tatitesuvofixadamemawak.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/b14e6d105e89c3d9e599b194fb91332d/kesozaraxeka.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/28409157749.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf57b26523---93802703751.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/bexukemonotunakojakux.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/gonugeguvapimapawedemexe.pdfIn PDF document text
    • http://splogservice.ru/content/files/widajusasagupepek.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/6bd03d5478ffae868085a9f4ad133369/tojekaradefujo.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/bks3rmq1chorsk8m28so6dhgo1/61674713598.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/woregotaxekiva.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/dinunuwebezejara.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/66282789744.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/26301035112.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=knock+em+dead+pdfPDF 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_off0000c706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC706 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF18 17412 bytes
SHA-256: 49b729ba0c1fa4c6bec216b810bf17e76c4564051c3a3da7f4b66aba824fc4df
font_02_sfnt_off00010c3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3B 10360 bytes
SHA-256: f55bd9d49c67af94c1545be5f780ff2226ac59f273e5fb54ace286a263ec6c82

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