Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bfedfefbdb3cbb3…

MALICIOUS

PDF

77.3 KB Created: 2021-09-11 09:06:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 84ed0231eef16fa105b00a5fec0f2fb6 SHA-1: c4e5f122a93162ac8598151215a5849018b4486c SHA-256: 5bfedfefbdb3cbb31cf7c433e79c8d93577bab701500f2316afc5ba97192dda5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with phishing or SEO manipulation tactics, likely intended to redirect users to malicious sites. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://avigailpekelman.com/sites/default/files/file/37248185619.pdf In PDF document text
    • https://braveathlete.net/geektic/files/fotozojada.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374a0023712---35236804030.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16139a584767df---davuvuzubopex.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/gezowepurojozif.pdfIn PDF document text
    • https://nls.vn/upload/files/virivekiraxowufela.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090300424873499.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/kuganavojininamukefi.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/ponibobuxise.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/ziwisudogefewurotuxexujaw.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/logajokalubiwedifabi.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/torelu.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/bomogizevodiweroruwija.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/zimojavoguzebepafurojoper.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/98107664163.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/bapukawofosejul.pdfIn PDF document text
    • http://www.depomatrial.com/file/wimawateneduxino.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/gononajowuriralululere.pdfIn PDF document text
    • http://uco-kampen.com/media/files/pudibevugeredakigadunu.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/fimufejogiwapalujukemagow.pdfIn PDF document text
    • https://membermimpi.com/contents/files/48059662771.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/94946915628.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/34edeb624551cea102bbb1dda68bd281/66969695283.pdfIn PDF document text
    • https://mayersoffice.com/userfiles/file/27401829050.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=best+sideloaded+appsPDF 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_off0000ca1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1D 18056 bytes
SHA-256: 6473c5472c6055825ce9fc1ea0d75bd0901c9e24f9c3b19b75b1bf628856975f
font_01_sfnt_off0000f861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF861 10236 bytes
SHA-256: 3c4f431fb2b24a20156a915f35edaa3e6925246f963fc610832bdb8034c4eb1f
font_02_sfnt_off00010f85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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