Malicious PDF — malware analysis report

Static analysis result for SHA-256 24cc127bf8b55bdd…

MALICIOUS

PDF

82.7 KB Created: 2021-09-11 08:00:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 87470247d948b67c62f6361471a9e740 SHA-1: 67fbc6e51c33ba16ba873ab5f0a019fefee4b000 SHA-256: 24cc127bf8b55bdd2ed7e4359109d6a4d6d1a520582341ab480eb4015a5f8bd5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Several heuristics indicate the PDF contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely leading users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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.annaleehuber.com/content_files/file/lubake.pdf In PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16133ce553cfc6---86710267520.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/vavekuvuxivomadubemakebi.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/jasav.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/34377804187.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/nojalaxokiwemamope.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/lawaxebuwulaluwepe.pdfIn PDF document text
    • http://freeski.hu/freeski/file/lisejose.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/vumixenos.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb7c6a812c---bavojibevisifupibaj.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/27903076841.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/juzodadixozimutamekumupe.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/98536935663.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135193409c66---sujivanesogubabanofuxobuw.pdfIn PDF document text
    • https://istanajp2.com/contents/files/wejidofujuvajajere.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/43542215717.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132b410b8e1d---37155360544.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/gazilavonowu.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613065b31bb19---vuligenobafubonubom.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/vunifurel.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/17212847039.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/moxopezama.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/tamozag.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210903105202_720026251.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/xazidewobidux.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/67082547871.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/0780d558ea78063419342a4fd780c8e8/dotowup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=the+millionaire+next+door+free+pdfPDF 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_off0000dc25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC25 18740 bytes
SHA-256: 83faa7f0795ca531bb81ed7e4e3d7209242e7e0d3d623ccbdca2a9f040f5e072
font_01_sfnt_off00010cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC5 10660 bytes
SHA-256: 6244b3ff571737c6300eb9d316fa6e27fc36e3f8310ad8b5b70739bd52d45207
font_02_sfnt_off000124f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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