Malicious PDF — malware analysis report

Static analysis result for SHA-256 e42663fc75effa16…

MALICIOUS

PDF

160.3 KB Created: 2021-09-05 18:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2bdcd851dce6ae8c1e8f13d2f83c2b4f SHA-1: c6b0231a051a6a22ba72d47fad201a8af701de48 SHA-256: e42663fc75effa16686cee8fcdb958186e5c0a0897395fd6c3ede605dadb7015
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely a phishing lure or a downloader for further payloads. No scripts were extracted, but the presence of external links points to a T1059.007 (JavaScript) technique if any dynamic content is involved, or T1566.001 (Spearphishing Attachment) as the likely initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9903

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://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/8gb5t77cfoh39le2hfhepbdivr/jadubela.pdf In PDF document text
    • https://europartner2.pl/uploads/33997754663.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/8359833416.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/piroxuvoxebagiwuwitunen.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/dc66058ff28ebaf9c30a63d76873af5c/mozarepezo.pdfIn PDF document text
    • http://augsburger-dartliga.de/uploads/file/67346446772.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/xolifurivel.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e550ed29785---gibokakawubigeb.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/towijebesipilipawej.pdfIn PDF document text
    • http://clerus.hu/files/file/84777170269.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081108296b9e---55270183517.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/dabekikorejojoxisesoxof.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/83434601066.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/55450616396.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/47637610868.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/79522981393.pdfIn PDF document text
    • http://naucseto.cz/storage/julusep.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/41883287520.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/jde4cpn8hf7toas5dh2kfho1a4/81237262985.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16072f4d2e125c---kilonaf.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/86550233656.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/11034714362.pdfIn PDF document text
    • http://lowndes85.com/clients/d/d3/d39312ffd46aa2fbcc4e4de04d96a17f/File/27492408832.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/lemelo.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/44509494399.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=protocolo+de+ushuaia+2+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_off000205f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x205F4 23488 bytes
SHA-256: f7eef43d4e1086984a40e17b02674be0f80c858423024c503a94a69f0fbc79e0
font_01_sfnt_off000240d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x240D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000258ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x258EE 10836 bytes
SHA-256: 7b6088ab82b0b5de3da8aa2e93a77b99b1bed55e542991be7477dc4033b69ef9

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