Malicious PDF — malware analysis report

Static analysis result for SHA-256 220714cd454660b4…

MALICIOUS

PDF

88.0 KB Created: 2021-07-03 12:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e2ae30445fa37a5e4defc22b02665aa6 SHA-1: d34b21e20675f6f46ed5e85c5af247567fa3ce11 SHA-256: 220714cd454660b4d297766bed9e1c88b4b10eb9668892d63f2ff25f8ad65f95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, directing users to multiple compromised WordPress sites and other unknown domains, likely to facilitate phishing attacks or malware distribution. The presence of embedded URLs and the nature of the heuristics strongly suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ef19c4b62---mijolenizarujewesoxawik.pdf In PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16202830272149.pdfIn PDF document text
    • http://vangphugia.com/userfiles/file/37986206406.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/pimerijotiga.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091efad67460---87041462138.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/nusedefasuzalaso.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/jegoxejumadisorexe.pdfIn PDF document text
    • http://nandeestationery.com/userfiles/files/84104732811.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/mufimasaxid.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/moxigigezujujosikon.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/fogebetalisarovimemalo.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/86495048920.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/thf95fiiu3lc2ism1ushatk5q4/sifowebo.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/wesazupunejitoxi.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/woledametozila.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/d0f7o6pmrm7l7c3a1ivm0d4f8n/vamokefezixizijekeb.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/69788263145.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/92451454120.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160835cf58e90c---26646889300.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/79daaeac109ca8c00fe50cc94c7b532a/wuvok.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/1v0u3ei44ckngmmubjl409r6bk/lobosenumo.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/robidugavetumo.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/relevo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=example+of+transparentPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10466 17668 bytes
SHA-256: 973a9af539fac7071cedbd533f0df5a521ed2f19c797049ae2f476827832c488
font_02_sfnt_off00013179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13179 10512 bytes
SHA-256: 25e8abaa67b7092abaf9e68e4e81c93608515b71ab4f7c1986d28e7ac54e9393
font_03_sfnt_off00014963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14963 1860 bytes
SHA-256: 562d39cc93351683f3420870a5578826c1285db13c691c08f99be18f4980e560

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