Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3ce371398d60a68…

MALICIOUS

PDF

97.1 KB Created: 2021-09-07 23:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 57c935a046764e769567a680ae0cc45c SHA-1: 8850df9c4c40c9cf152c08bd9641b163b36c632a SHA-256: e3ce371398d60a68346890963cb3fee1aee67c13bacc58020ad4cb65de117775
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to host or distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/b88ba853764bae6453eb0c94f68d9cc0/68348800398.pdf In PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa7f35da30---38129042665.pdfIn PDF document text
    • http://platcometals.com/images/file/zuvuzikopaxexaladuko.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/68833251202.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/vudixozuk.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/vogadake.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8ddcb5a6d---23551765607.pdfIn PDF document text
    • http://fgosvo.ru/files/files/podiwenumavadibateki.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/inmb29btv9j7js8qjfqi251q79/8043377796.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/bibopevokudunuruwebe.pdfIn PDF document text
    • https://ip-pharma.net/data/files/75507519292.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/01072c7480f3adfab9c6d6058117f350/62929784445.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/fcfe99ed1bfe98a78d54f8eefcac0c0d/57828690020.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/movubebiwojogaxumamelasi.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076cfaa98588---raralegapezo.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/b661038dddcceea78590273e09dd8da4/71791651727.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/95210451270.pdfIn PDF document text
    • https://termocasasrl.com/file/38605889825.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/67258195396.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/degagexodadalasesaj.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106f3a515da2---tenowo.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/cea397abc8fb5fdb81c2d77d3bf929b2/60453904115.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3739236fa---nifenunifuduputa.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/79862334989.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/8e2d1a1fcccb1f56c77478cc2fe2abd6/45449122039.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/lidojikapojepizipudojozat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=boating+merit+badge+worksheetPDF 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_off000117c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C2 17404 bytes
SHA-256: 7220b0b20844eaa42fe922f84d9e6df2e69f772bc598d1e2516da194404e98bf
font_01_sfnt_off00014558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14558 11020 bytes
SHA-256: 4c4f4137aa65f9d5a70f56b75ae1d3ae6598b92e9fd82409f8ad98e815f017f2
font_02_sfnt_off00015eb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1