Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd840e6242b50319…

MALICIOUS

PDF

71.4 KB Created: 2021-09-21 01:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 16f7dabbd273b471b457b383c371f4a0 SHA-1: 271d81b997fa1c00b6d195db3072b3145284a609 SHA-256: bd840e6242b50319701bc140cf6afbec12487a77cf113c8330c313f0ee32165c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and ML classifier indicated high maliciousness. It contains numerous embedded URLs, many pointing to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The `utm_term` parameter in one URL indicates a potential phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://cructi.ru/uplcv?utm_term=need+for+speed+hot+pursuit+hd+apk PDF link annotation
    • http://www.39koratmachinery.com/file_upload/files/38604021439.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/nezavavusawimo.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/mipomutuwiku.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/binorurezawegedovo.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/av9keqf7amned3nghfijnhcvms/guxilivufujemimewivepat.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/70269618653.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/xaparikogejip.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/buxuz.pdfIn PDF document text
    • http://info56.ru/userfiles/file/vumosikaraxalakejoduxigoj.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/81601960892.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/10646733571.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/6294721076.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/webasedapidelemukoleg.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/24380a7b2762663155c6024449dc521d/pebobamugavuwenolokis.pdfIn PDF document text
    • http://standardamulet.com/files/files/gulazuli.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/50538034834.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/30040972390.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/40641449339.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4ac0a0ceb---pakejisuwituxeveduvirula.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/kusosif.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/venanegu.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/jozodutotebanuxagujone.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/tatugikugerami.pdfIn PDF document text
    • https://unaizahic.com/Files/files/turarofaruri.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/bagazunilolejopifalidax.pdfIn PDF document text
    • https://phunhai.net/upload/files/28958155900.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_off0000b672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB672 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE84 15356 bytes
SHA-256: 47ee67e80b223fc3b1dfcbcf5fdb54ee393febf335468607e7a777b89d5f8aa4
font_02_sfnt_off0000f58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58E 10616 bytes
SHA-256: 7c1fa723f69f7b6c272a947297f27a4ff3774c3724e88fe21b1ad031d62b5088