Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b807ac88243bf34…

MALICIOUS

PDF

91.2 KB Created: 2021-07-20 04:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1d0d728b8b87eaa3da6941e70c70603e SHA-1: 5b1a9d721aa6898cb7624336b33297f8d91d8527 SHA-256: 0b807ac88243bf345dfdcacb4c61d748e4d81ef295f2e99e549e58dd609115aa
164 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple unknown URLs indicates a likely attempt to distribute further payloads or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/00d77453cf9881d2b75f7d9506c3478e/tonolarom.pdf In PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6a38c3d8a---wuxedidepagajufinabusiw.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/xajeruroxuzogivurekepezug.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/c79fe7eb3ab2c0a0ddedd56208af4b10/bonogadasulogovirakodin.pdfIn PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/ziluf.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c2cfeeaf84c---43996159791.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/gavazalasexonewamo.pdfIn PDF document text
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/48016091787.pdfIn PDF document text
    • http://medica-brno.com/files/22338964788.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/26a435e5a907cb3cd3af7edc7f07fc73/napujegumigawomix.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/6f78ceb55199e35af261ef08d68a91e7/zotabeze.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991754275b3---71551354974.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607972ce8658e---61470988688.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/52478413986.pdfIn PDF document text
    • http://slpclassof67.com/clients/45391/File/vetesekikupavediwadojava.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c22b9f3772---voten.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/90407683716.pdfIn PDF document text
    • http://kino-cosmic.ru/sadm_files/23322804616.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160cf77e81b3c6---21418520472.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/ddbi7njth6ph3qhj3aq42nto0j/ruwabititokavorolofokanit.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/50209928585.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/976a8ff59abfae70adbb75cb7bc7ec6b/sasuranexenivodatizusixo.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/22623891848.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=welts+from+coldPDF 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_off00010224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10224 10272 bytes
SHA-256: d6de4a67462726f75c3a911c13fd0ab5efc7cd202f51d98c2cdffa656f308936
font_01_sfnt_off00011954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11954 17984 bytes
SHA-256: 1ef574a4ee5d97869e1b4e696a7f86d1deb66f9c72331de82cfa924a986b47bd
font_02_sfnt_off00014812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14812 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1