Malicious PDF — malware analysis report

Static analysis result for SHA-256 538aec51a726bddc…

MALICIOUS

PDF

82.9 KB Created: 2021-08-31 14:32:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 14525bd8d19c18dd9a427ac71ac55d68 SHA-1: a97ab6b159662380e1014410b12ddd1c48cc4c45 SHA-256: 538aec51a726bddc8f72479f079c962cadbf5f1c39230d29cb5c9b4cc1305454
156 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics as containing a link farm pointing to potentially compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4bc03e9d2---disunetamiz.pdf In PDF document text
    • http://studioboscono.it/userfiles/files/78873934978.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/2895786096.pdfIn PDF document text
    • https://kermanrooz.com/img/files/judiromexutejijelod.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe1e3d9f45---beworoja.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/34756108907.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/80707360845.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-7/20210507024616564742.pdfIn PDF document text
    • http://rideco.hu/upload/file/63238140906.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fb64e936380---pivivetulo.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160df2ae115a61---fefon.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/tunolaxigizinogapilolaw.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/bugimuwafoxexiloline.pdfIn PDF document text
    • http://goref.ru/files/file/jejakekutu.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767513d4fd5---xovifofawilom.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724cdbaf60a---rewiwedozikarukoxafa.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/jixapomimubexatufeb.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce2d03deea---ruvotinogixedejenaje.pdfIn PDF document text
    • https://xn--mgbaf4adbs1bd2i.net/upload/ckfinder/files/41753802208.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/matadudajabudexawibibil.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202108041925063850.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/vlll7d8j5p3m2ki9h029qk971d/lidiruxiwapefawisojesub.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a51c488b4b---29770811539.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/xewoxepizuwodegegugafupuv.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/ed8e01cb97be60235cb14eef2ad02461/13899629122.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=code+for+warzonePDF 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_off0000e0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90A 10120 bytes
SHA-256: b5812f33c25a697e95095b75fa317b4d8a4afb238e560bc1a294990d8cf1cb4f
font_02_sfnt_off00010fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD8 17708 bytes
SHA-256: 990300771cf4c624ece39471241440509d21ada121b8c9a45d7fd708b02d5d8f

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