Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3e11dbbcba43f01…

MALICIOUS

PDF

78.1 KB Created: 2021-09-05 19:31:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: caf26dc4e8df1cda2617c64bd581555f SHA-1: 18b569b46dd2fe129f1e9c11d7a49317c29104cd SHA-256: b3e11dbbcba43f017f998f61acbde1cba0b5616cc6b9fdd4667d362783dd52d7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://giyimkent.formenemlak.com/upload/ckfinder/files/53570287996.pdf In PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/85de69288d47abd079648e620fb611dc/mezupexojixasivuwod.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/99968129076.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/e0ij86pn03v3opraiamv54cil4/18183343097.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/nedasojuj.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/peses.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/68206687636.pdfIn PDF document text
    • http://creationart.hu/files/file/58860750702.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/kofobipewe.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/natisimisagifazadig.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/topusatuj.pdfIn PDF document text
    • http://hanifeugur.com/image/files/48188507460.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/47625581637.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/giposepudekuku.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c2645b2c816---81447270974.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/remezidelasus.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/cde7869e430db674a203e9ea87c1c1ce/buzejetakemokupomew.pdfIn PDF document text
    • http://aa-nusd.jp/48813886189.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/98492a74140aa268f3320c192793d8ce/tawilurotodoxuxuzoradav.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072394236642---nisasujegogapusubuxebela.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082974d56280---14913021829.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/lukesexedinozav.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/70546697103.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/zumuselewafux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=internal+and+external+locus+of+control+worksheetsPDF 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_off0000cb73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE385 17044 bytes
SHA-256: 9bd8f9d40731c622494df79baa5422310728ada169d247894180b0095162bfb7
font_02_sfnt_off00010f8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8D 10812 bytes
SHA-256: 328719696d6d66046bb2d9a66d3ed0813baca9af3a50625238008cbce1ab02fe

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