Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9d0b904e6bfd3b8…

MALICIOUS

PDF

78.1 KB Created: 2021-08-19 00:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8c930af1f21f914905354c16721ea87f SHA-1: 1bbe7099df2851401bcc8aec652de1b72e0c0fa3 SHA-256: d9d0b904e6bfd3b81e68c5708821c364a9c31a10fadbf615f37c4546a4d182a7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to potentially harmful content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5182

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • 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://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bce94ab2e4d---57686160234.pdf In PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/dogiwunad.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/lunototixifanok.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/fopupa.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/9a18d1020313ec21e5a0b05a1fdf5628/zunajijugewepoluv.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/97321644979.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/fidesijifolopide.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/8d066fdb8042ba9226e9ac3bc5cbe0d4/kebasitakusujas.pdfIn PDF document text
    • http://zerosquareonline.com/file/rejiwajinimonu.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/puzav.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/7e98f428c6932c5b5cdcdc305156941b/8055700847.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608828f25797d---xudukizivosowabadozefaxuz.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/jigobo.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/3a4b43ec6d07cc335095b3f0d25bc49d/vomikamozesa.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/71429361135.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/6gq6vvod95hs1t1435khu22ank/muwuf.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084692babe9b---rarivilokupavoreman.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610fb58fdd9f9---giletaladawopelufavivilo.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/84043538128.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/34683683600.pdfIn PDF document text
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/mutotozofotunifuduwegi.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/fezef.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/difodunoxegofufu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=list+of+foreign+words+in+englishPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C0 10516 bytes
SHA-256: 2e3358897d245c5088ff39ef0c48a2c43618c4fb5dcf499257a60b4c7d925cf2
font_01_sfnt_off00011073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11073 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1