Malicious PDF — malware analysis report

Static analysis result for SHA-256 686454e9ec89c29a…

MALICIOUS

PDF

72.0 KB Created: 2021-09-20 19:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c7fb7729198aadf71f2a86a748f79837 SHA-1: a05999792127b2538b797671006bbd6312ea9d9a SHA-256: 686454e9ec89c29a5524f9f67fef25a60564dff2c503af6892ef3dab82b4f5ff
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating it is likely a phishing or malware delivery attempt. It contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit vulnerabilities or trick users into visiting malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9284

Heuristics 5

  • 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
  • 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://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b35a2f212---nasufumeterelaziredowaz.pdf In PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/54708201765.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/d1b75f69bd47dec5089f9350739087be/wewoxul.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/tixudot.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/57321960336.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/zevoxemam.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/72887829193.pdfIn PDF document text
    • https://deepex.hu/hirek/files/vusujirivevawebimifevuva.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/bakegavakin.pdfIn PDF document text
    • http://xn----7sbndn5at.xn--p1ai/uploads/files/begovenedomixe.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/segakemobinugin.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/wofatekezu.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/6242427164.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/rogitarugelopopaderujixeg.pdfIn PDF document text
    • http://hnspkjx.com/d/files/novobi.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/nufofudulojuti.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/sokopojigibi.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/foxawexolo.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/97618376440.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/73602570812.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/repubavo.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef468b43a0---56991189898.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/xoranatovat.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/4344723205.pdfIn PDF document text
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/vafevuliporexuvaregaje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=o2+settings+for+androidPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D9 18416 bytes
SHA-256: 427b18cec1a1f3aa7efcb1971d5deb0a975ebbf6ec01858b77f852ca28b50539