Malicious PDF — malware analysis report

Static analysis result for SHA-256 39c5110422fcd47d…

MALICIOUS

PDF

79.3 KB Created: 2021-06-29 01:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 71debec83e0bc411f2dd5422f09f1fb6 SHA-1: 5cef8212cbab034ea96c58a134d574471b13c057 SHA-256: 39c5110422fcd47d9f5e15bb3e349eb08f0080644840c88521593325b50f6aa4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting. These links likely serve as a distribution mechanism for phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://nomylo.ru/uplcv?utm_term=the+end+of+the+game+weezer+lyrics PDF link annotation
    • http://stylowa-pss.pl/userfiles/file/tunefotaw.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfafca826c---rasodudexufilokajumefowug.pdfIn PDF document text
    • http://abnicum.com/files/file/votepewitaz.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c083d3daaf---58149592093.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/1032988106.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/dfuaaad861nc7taurtf42pkm3b/85095986850.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160af9fb5c9274---gavivedapigiluvepola.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160bfedda837df---27495848763.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/2079e438d4e12bbf70b3397e0bc22ef4/98051844439.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607225b136351---68498872040.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/313fdd1f10faac06375c3cdf3c58c761/15862142036.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609caf19eebd5---sopirapinemuzabaw.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3d023a4e4357bd23453d358351284422/49381039425.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856621501ff---17478807333.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/bomuwod.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/lagarelobejovujupojizib.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/81796511545.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/47465268450.pdfIn PDF document text
    • http://cbwmd.com/uploads/Files/muvet.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/549kt4kcjvmric1323nujs0nuh/18080383033.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/komazujapifirex.pdfIn PDF document text
    • http://beijinghuojia.cn/userfiles/file/14489314346.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082e36842546---64887607560.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/wosasedud.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/gikanewogixumobuline.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_off0000d050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD050 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE862 17092 bytes
SHA-256: 6eb8d64d5544e11bde30348df6858ffac3d5f7c602dad308654b70b9d5e451d2
font_02_sfnt_off00011437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11437 11144 bytes
SHA-256: 30449f50660ca392ec26675d2bc516d8dbcacb73f79edfa1db3c93fb2b077676

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