Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8bc8e5800b72795…

MALICIOUS

PDF

83.3 KB Created: 2021-09-03 00:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4469b7893e079e083fa39bee02960b63 SHA-1: a280564a472aa670f465097e04256e23530507c8 SHA-256: e8bc8e5800b72795190d3beb9c386b073477062a9587858e462c267a22164d5b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest a phishing or malware distribution intent. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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
  • 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://drafthe.ru/uplcv?utm_term=relative+clauses+exercises+pdf+intermediate PDF link annotation
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/aad20722d1874d603e627df0fe4388f4/fufuba.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/37489507138.pdfIn PDF document text
    • http://bptramptour.pl/files/file/34681160324.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b3a71c412---tipevumitopusokopudote.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/wazunuwet.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/70044968083.pdfIn PDF document text
    • http://blissworldbeauty.com/newerac2c/userfiles/file/sanimojamobelififurax.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/xagoxamuguluv.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20257457135.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160af2ee0c385c---68837325891.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/nasatetu.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/newiroxemukirenupanogifuk.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210707125618.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0767cd6e12---nunotetefadadabebetiveruf.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161061ae5e0b61---negunifosodolisidonig.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/jiritile.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/86936104126.pdfIn PDF document text
    • http://creationart.hu/files/file/26418100560.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/fowadevebewa.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/b0te715ev59pq6hcqp9kugi892/6662115297.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/17492172919.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/b4b7d3e8b9c3723b41a4d2ef58b5ce4b/23022392802.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/boxowalozupu.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210516/file/44879218466.pdfIn PDF document text
    • https://lapdonline.org/file/72458795742.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_off0000e041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE041 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF853 17356 bytes
SHA-256: 430384b2590bdc227a953069b9ba90ccf1df1daa51cfa8fe9f16d90de7b5e3d6
font_02_sfnt_off00012566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12566 10972 bytes
SHA-256: 7d3d5c7d1f18a51c065e58534a75bbcc4df3bb67314e45fa44242053b35090ae

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