Malicious PDF — malware analysis report

Static analysis result for SHA-256 89be5a9703aa5170…

MALICIOUS

PDF

75.9 KB Created: 2021-09-06 10:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9aa5ff7cb3d429fb57e88120ee815669 SHA-1: e0ddfc79a50729178c97d7bf3b5dea783c7a2f78 SHA-256: 89be5a9703aa51702a4415151aecf80dc917d07f2b3afde1e171c7363efb7bcb
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 a phishing trojan. The file contains numerous links pointing to compromised websites, many of which appear to be hosted on disposable domains or utilize formcraft plugins for file uploads, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://crysiq.ru/uplcv?utm_term=compress+pdf+size+upto+100+kb+online PDF link annotation
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/161233c5de1b17---pejibowojoseligejigiraleg.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///17373121014.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/tisuvegomerogezojuxiwuk.pdfIn PDF document text
    • http://intestinalfortitude.org/clients/0/0c/0cf504f131cb0201443a7bd449519f4a/File/98992034510.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a3d5df082---tijexerewebabokoj.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607cab76020d7---sisan.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/2e6ea5895a8be8735ea6a375e47c617e/vojatumosibanorowul.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/29320813269.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/noruxeguwewibujonupasi.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/fulom.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/1cd5e48cfc4b89f90609ae4268bcead6/84099278610.pdfIn PDF document text
    • http://portableandcool.com/files/files/lavomoza.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/43250739138.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789631e4489---mugura.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/3dl6snbb85sdqkuslb0s9jh7k7/wijasokije.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/xomipitulubex.pdfIn PDF document text
    • http://hopkinshigh62.com/clients/7/77/7764523e397120ad9b09b1da26998858/File/vinowazonuba.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021051412183522.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/mupifukademelusexetuxuw.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/e7b4a801ed8205ea64cf63672144220b/71269294982.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/80314158396.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613421730d738---xajobakowosewinizivonetil.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210803022507.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160afe38b2935e---89239583154.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_off0000c3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F0 17140 bytes
SHA-256: 1907e86acc7d0bbe2870600f24c0708b3d7e3b970b91803dc6c9085787b6b5dc
font_01_sfnt_off0000f061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF061 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10878 11092 bytes
SHA-256: 9fbed0e8b50d9d117ab86dd905ea784901d36f708d8afd300171657a73e5bb1e

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