Malicious PDF — malware analysis report

Static analysis result for SHA-256 286d5e9a11d52772…

MALICIOUS

PDF

89.7 KB Created: 2021-09-04 16:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 91d49c631202bdd8697dcab71491a890 SHA-1: 8e63a0a502553c59458ec8a31fcc31a76df2c83d SHA-256: 286d5e9a11d52772ae4d87276e0c60c618b445bc6b1bdbbe2d7b46f618dd863a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://harperfamilyreunion.net/clients/3/35/3566a42c83b0accea4ba2bdfee5c7976/File/mopavemop.pdf In PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bd53a6e84---votumokevazav.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/5097685164.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/kexolunesigodevex.pdfIn PDF document text
    • http://poledance-chrudim.cz/files/file/xesexojunasulukifikazad.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/29799145762.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608486c2f37a3---32114659288.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/kiledomabatukix.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/fezoz.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/af34083247dca1ee5d8764854b0ddc45/92553783095.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee1921409b---rapanonopewutot.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078cf53e30a2---8003768010.pdfIn PDF document text
    • https://datajournonepal.org/files/28374728238.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610827282e3d7---70477487266.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7824b7132d---18222154212.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/64042626875.pdfIn PDF document text
    • https://inncredel.com/uploads/66636019949.pdfIn PDF document text
    • http://apsons.eu/files/file/jopepaxunefiso.pdfIn PDF document text
    • https://sibconsulting.com/contents/files/donivuxusovuzis.pdfIn PDF document text
    • http://planetamama.ru/files/file/kedukesizasenum.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/60958086092.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/3cbee531091bdca8fb739e606247c838/42784633833.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/retomulowux.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/fba4b936c93f51289b33a8cbda29bfdc/26157675231.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=zinken+compact+21+manual+pdfPDF 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_off0000f41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C35 10840 bytes
SHA-256: be4d9ec891d03acf258a5e889c354fa3e49878d3c163d7c9fa2620989653ab50
font_02_sfnt_off0001254c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254C 20208 bytes
SHA-256: 57a0258f62d053856239835bcb8e977ca30da26a628d10a791e88d2e77d9b752

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