Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b50ae303f0cf106…

MALICIOUS

PDF

55.7 KB Created: 2021-06-21 04:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f008d10c47c553f317e08312eebdf72f SHA-1: 71f0d1365f36b87f996d9b1291847f05e0d6e8f7 SHA-256: 3b50ae303f0cf1062f7b46fc5940eae2cbebfc47af87cd93600aec8141cc21cd
154 Risk Score

Malware Insights

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

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 pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document's primary purpose is to host and distribute links to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9438

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://irlanc.ru/uplcv?utm_term=destination+b1+teacher%2527s+book+pdf PDF link annotation
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609160144c5a7---95262991153.pdfIn PDF document text
    • http://iwishop.hu/file/40893554359.pdfIn PDF document text
    • http://noahsmarinesurveyors.ca/userfiles/file/dalodotuv.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089452c64f6a---74210590664.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a598e5a020a---mopezojugomesu.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/bilebovaji.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16085e8dcefca3---tazokiw.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/74602965722.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/wazop.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdb53ea7d6---wuzavomusovofozizinobup.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/mgtdb2uchl1jcn0884ts1d2g13/vezegujavolunaputuzirale.pdfIn PDF document text
    • https://x-software.cz/data/file/jujefeburegim.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/togujem.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/9d40af3aa58159e667257a350fc750eb/58085780707.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7ce56dfbc---41183727148.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB7F 5500 bytes
SHA-256: 891bffdb6539605302dfe5acc7188e6557866107fe0a7f1e13ac4f5e43cf69c3
font_01_sfnt_off0000ce33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE33 2836 bytes
SHA-256: 22a8836661169a80d207252cad6797eda3e129bbaa2596d48d5043854f1d0971

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