Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fb6e3525a7eb4de…

MALICIOUS

PDF

96.0 KB Created: 2021-08-21 14:36:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8e2c199a0cfbf393b8010819a43ba4bb SHA-1: 531e8b8931587b2b2b0023d3118f8e46054a58e7 SHA-256: 6fb6e3525a7eb4de839065fed14b287dde894a8dc5df4f309d2d73aa0cfa9910
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute phishing or malware. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating a tactic to obscure the true destination or leverage compromised infrastructure. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://philabc.ru/uplcv?utm_term=how+to+make+odourless+pig+pen PDF link annotation
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/bb2a64c6e6f75ac2286dc2a42ff1bfc1/50255207718.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/5aslnoplnig9jjjbielssrrdgu/41549956134.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/vomixikududixofedalid.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/jeropafumisug.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/11624317250.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/mefuxujexinamadezenar.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • http://fujavietnam.com/images/Download/38750197681.pdfIn PDF document text
    • https://clinic4lab.com/upload/ckfinder_temp/files/20210624155227.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e0458037f---betowavanuxevexa.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/14959481373.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160867dd292fa1---94515580946.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/779c4f6b2a5d70cbf35aa71ff01fb006/daletipupovutetiwemimi.pdfIn PDF document text
    • http://hopkinshigh1961.com/clients/878968/File/86643854814.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f5233dc21---90221209107.pdfIn PDF document text
    • http://wami.cc/data/files/duvuvo.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607036353ad07---3543518585.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/kesuxobuwazilisukirojewa.pdfIn PDF document text
    • http://bkbflooringusa.com/userfile/abbey/file/56185152527.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/turobol.pdfIn PDF document text
    • http://ruegen-ferienhaus-schneider.de/userfiles/file/pobefusutox.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb1faef092---61154397549.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_off00011258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11258 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6F 11004 bytes
SHA-256: 7697b3ef305bc142a42999b4627f5527b1e6c8dabb6699ed7e6e617fd758938c
font_02_sfnt_off000143c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143C0 17488 bytes
SHA-256: 8996730cecd14374909352208b1d1bc4212b0be0e38e14b0d5f63daedf0029de

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