Malicious PDF — malware analysis report

Static analysis result for SHA-256 53ebf1aca986e282…

MALICIOUS

PDF

75.0 KB Created: 2021-08-08 18:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 03d97becfda4c28dc5e9fdb0846a079e SHA-1: 6501b6687ff44cc81d0f73d07ada02531a34b0aa SHA-256: 53ebf1aca986e2825bcb375a1035cdfa989ffad9dadb192142f9d14dfd1e194c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.escon.it/wp-content/plugins/super-forms/uploads/php/files/8cabecdfb36080f539b5c4dd0df1b01c/93777918441.pdf In PDF document text
    • http://bainihu.com/upfiles/editor/files/29634263915.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/93788055248.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/7907676494.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/nobujoxekemusogixubutilof.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/94990311674.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/jufukaxufebu.pdfIn PDF document text
    • https://topupdana.com/contents//files/vivuriko.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c495408c19d---fesar.pdfIn PDF document text
    • http://whatdwellswithin.com/file/23254479772.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/48574930630.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/2fca61c951725d2ecd8cdb09277a6da5/masesixamosovadijewakal.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607780ed27b31---kurajorolozatipomi.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/46713747138.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/20123436575.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/japawajifizokaliwu.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609239641c173---duxexoxojep.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/21073102473515151777crlp.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/fc990d1d15bf2cf860b18d648b5bfe24/59857330902.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa17a00dc8---2923810441.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/gewiseluxojitukulukirar.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/2608658d9073cc28a96155c45e292f95/71827953655.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=revolico+holgu%C3%ADn+motos+electricasPDF link annotation
    • http://s250801404.onlinehome.fr/img/uploaded/file/lozobelupunefiwuvofaliwi.pdfIn PDF document text
    • 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_off0000bf89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF89 17196 bytes
SHA-256: 5eead5bfc07ca88f7714164dae85bf4735bd60a458de447611fa2ecdd38743d3
font_01_sfnt_off0000eaf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF0 10948 bytes
SHA-256: 03499ab8513836534dd1ba1512935a85b3cd0826400c6030780a216d12c3c01e
font_02_sfnt_off00010426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10426 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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