Malicious PDF — malware analysis report

Static analysis result for SHA-256 a217219c387bbb2e…

MALICIOUS

PDF

90.1 KB Created: 2021-09-04 09:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5d8e38bdc4de7bdb5758e2805f742bcb SHA-1: 6ee141634f7de8d64ba612f42dd1553b70e41e0d SHA-256: a217219c387bbb2e98349b0e31ef6828771582044bc72383a53d747072ddb552
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous compromised CMS upload storage locations and disposable hosting, suggesting an attempt to redirect users to malicious content or for SEO manipulation. While no scripts were explicitly extracted, the nature of the links and the PDF structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://vmwarts.com/ecovic/file/zibuwufitatako.pdf In PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/94368315960.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/d2390692c98b604e0d2ad32ef4e2e75a/miligugixaxemox.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/wurul.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/59408444331.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/1380581638.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/85326717927.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/101248202230.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/20127842937.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/a41ce260bbad7ce5c3c19bb7597699a0/25524431947.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/87508387193.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd550736ec8---16715472784.pdfIn PDF document text
    • http://leguido.net/files/98755532050.pdfIn PDF document text
    • https://thepainter.asia/upload/files/23084919950.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b5d0a70f9---dixiwafiguwar.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/wifir.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e044beb67d---71864001325.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/061e1e88f8b654a1d2c43d0424f268e7/vagelodoxuwevixakubumetev.pdfIn PDF document text
    • http://restorationteleconference.com/clients/73716/File/xirok.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/tixoromuxunoxorajopobari.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/85103017421.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/as0vth9i62h7t3i0noj0kpr3c2/wenewiko.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ca289d8ec---84019921905.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=area+of+parallelogram+worksheet+tesPDF 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_off0000fc3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3D 17612 bytes
SHA-256: 899ca39a9eec348705d09ddd3d0efa256941361b08cb673a27465199b66f5a16
font_01_sfnt_off000129ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BA 10768 bytes
SHA-256: 952c76612827c739f80c8a6d3a55b7cb0ab3bc5f8399401387bb91e226b28f81
font_02_sfnt_off000142a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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