Malicious PDF — malware analysis report

Static analysis result for SHA-256 92e9d2869cae334c…

MALICIOUS

PDF

79.8 KB Created: 2021-09-05 20:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8a4c0e3d1be3f6957c7fd3d593ce43c0 SHA-1: 9b35106e0df93132d50b646a428af2dea2de0569 SHA-256: 92e9d2869cae334cd87e5e8296024b020f13d23656379c246ec4365e3e0e0e44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to distribute malware or phish for credentials. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is part of a phishing campaign, likely using spearphishing attachments as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://aduanaldelvalle.com/userfiles/file/wapakikisoteziv.pdf In PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160fba2b4d606e---walubafepagatemilanezer.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/mujewafib.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1557a7b0ae---jiwepufokupunedutasida.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/zobubaxulukuxijal.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e388d746aa8---xanawizukebutevir.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ce3e9e0d9---67106840017.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f22e60c699a---5431232397.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/nogukoxafawupomamomek.pdfIn PDF document text
    • http://gchsclassof1970reunion.com/clients/6/6a/6a45fbe13d63dbb0eb8070d7cb9dbc89/File/denixidopogilazoj.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eada898392---mizuwanav.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/woruxelizawinudenajuz.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/goraxuzurekosixebonigaw.pdfIn PDF document text
    • http://weymouthhighschoolclassof62.com/clients/5/50/50fe23896e84432c97ff20d680692bb9/File/4848772834.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161043a5f688c0---59599655128.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/wabowuwomudepewewezok.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/hio8q0j01uei9tjjlv3pr0mtb6/42234159094.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc93ed4f9d---bujirizuzujamikom.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/24785063071.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/xopovigobojigasodulu.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd28069dd6---44325071047.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/mopitusufotera.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e0eb7347cf2---80969125145.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/eaa866a148689b87d590d92d9e08579a/koxekubisorisok.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/sefuburawosorubireb.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/5a4502b57a22c9169c972f9a46e6a26b/vesudazonunasepaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=biography+of+abraham+lincoln+pdf+free+downloadPDF 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_off0000cf76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF76 18688 bytes
SHA-256: 77448c9c731a7a9fdc90658ef7d68d502f6caaf7713aa7ea84a29997772cf18d
font_01_sfnt_off0000ff69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11780 11196 bytes
SHA-256: 79e419d63b5503004a4a3ac1b760ba100eb19cd6d788d917e40957013b7935cb

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