Malicious PDF — malware analysis report

Static analysis result for SHA-256 8db449d1e9a22175…

MALICIOUS

PDF

73.5 KB Created: 2021-09-01 11:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f44d79e2101d0d16906eb158c85f4fe6 SHA-1: 2d01b5966a9fd2fa4ba88287b900c70282643839 SHA-256: 8db449d1e9a221755559721713030ade40309fc51f39cc0992f1c324b7fdccbd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://smidgel.ru/uplcv?utm_term=how+much+is+it+to+laser+off+a+tattoo PDF link annotation
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/54284222938.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608978473f4f9---18215032235.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/d66e33938fed72d3ddc1477231b5ce31/newasesodivunawug.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/7bf2d58737efb87d855174a5c1955960/72123940075.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/79827423341.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/24978050479.pdfIn PDF document text
    • http://cmtsport.com/pliki/37094160716.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/pexesep.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/kolukexupoluta.pdfIn PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/24494836315.pdfIn PDF document text
    • http://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/jipedevefenufeb.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac05ad2f947---gerekogo.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612efd54a302d---26055552033.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fe652e0132---bufidi.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c3c0f0e1e3f51419c92b8d74de96b27b/lafinevuzojixuz.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/e436qqprq8m1b8ngbglpvic99d/50283592575.pdfIn PDF document text
    • http://casaalu.com/luutru/files/bujetodol.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/rukifebasefavedoxuvob.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/kosikiwikukapasosalepug.pdfIn PDF document text
    • https://epiphanych.com/images/file/85956037610.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/tuklojkutmlvjno0kphfgr8140/dekazosiroge.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607efdd575efc---zitanugatowumerowote.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_off0000c004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC004 10672 bytes
SHA-256: ecac0a3be8d07a96bdf9b5347482887c0f0852bb77a6664cafa42131afa5aece
font_01_sfnt_off0000d886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD886 15424 bytes
SHA-256: 7c16daa6518cdcf5381342b76151a00f5b69ff8a2dfb39d2aefdcdb5e11742d2
font_02_sfnt_off0000ff87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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