Malicious PDF — malware analysis report

Static analysis result for SHA-256 5452584bced203c2…

MALICIOUS

PDF

79.3 KB Created: 2021-08-26 22:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6ae77ed2c2b97689a327eab78a34802a SHA-1: e0a79eea048ca495f6eb84be810ebea60ad031ef SHA-256: 5452584bced203c2524b5667d8c392a98d50c28926e0ae0309038120e892bb56
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent but reinforcing the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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 http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf867397aa---vagurebonifupevozex.pdf In PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd5e81c0fb---37864360478.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/werurinorigavob.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/92141174226.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/jivumevufobonuvesuwiwudif.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/9b463a1d34855a14e8b7f34293a0ebda/43103818511.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/47740a50b5fe766f588bd79b1095e349/25775966857.pdfIn PDF document text
    • https://binhvi.com/upload/files/sozugepowusuw.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/57452025002.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/58594699365.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/kukemuzuxipupetawa.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/13673494825.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210705_A2FA6170C0143359.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/57448128077.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/27c613e902aac73aa3dc16ce7518f9a4/vomabobi.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/kelarofusemireresuxuguzo.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/59111797267.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/ripoxe.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/lejomudamulo.pdfIn PDF document text
    • http://atomleasing.ru/media/File/ninebuzegasavaxekebadik.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/25505177918.pdfIn PDF document text
    • https://stavbyhes.cz/ckfinder/userfiles/files/69857438208.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/ledugekivakoga.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/loxidofuzekevaz.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/89978341958.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a26e26400d4---51079863364.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=sodium+in+food+meaningPDF 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_off0000d718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD718 15644 bytes
SHA-256: 6e4de349b38617900f8d9f01e91f2a7acf6a6664aa4c6280a5f8eb12640ed8fc
font_01_sfnt_off0000ff22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF22 10460 bytes
SHA-256: 1833555db69953df7defec8b7404e889c9d4d8baf57b1687caa9b370525e1a6f
font_02_sfnt_off000116a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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