Malicious PDF — malware analysis report

Static analysis result for SHA-256 dad364e6e2b4c0f4…

MALICIOUS

PDF

89.6 KB Created: 2021-09-06 09:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d043d4ea5e4eba9de750bdc74a8a9186 SHA-1: 373f12c79215fe08cc473a5313bd14c2deef4009 SHA-256: dad364e6e2b4c0f42c0fd9368d0f945ca342d27db79c26e0794b2bf78cd2e4ee
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it likely exploits a vulnerability or contains malicious content. It functions as a link farm, directing users to numerous external URLs, many of which host further PDF files, suggesting a phishing or malware distribution scheme. The presence of multiple compromised CMS upload links further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/5c9aff7dbb9bf30fea9132205d5cf02d/84075498299.pdf In PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/d3bede6ea6f19c3cedb5356fbcf40d34/gadosit.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/tuxapu.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/ivom2g9qesm9plmpnei48s325u/99476808532.pdfIn PDF document text
    • https://takitech.hu/userfiles/file/kikalojuj.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202107/file/18087411737.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210429054506179.pdfIn PDF document text
    • https://ptogel2.com/contents//files/javir.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f17c03015f---40683660901.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/b88395d19fdfe85c4088b7788e784bda/savogevipoburima.pdfIn PDF document text
    • https://fultoys.com/userfiles/25281724147.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610600b3ba343---74261585831.pdfIn PDF document text
    • http://smartcevent.com/clients/871459/File/zezawuvidukunip.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/mogel.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/9892721481.pdfIn PDF document text
    • http://lysfyyy.com/upload/files/26960664063.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/35652658064.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609433ac7fd3d---sebubol.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/89e2c8ed05150a5e89ff935ba9904362/43024776994.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160845fb6c1d21---53182345641.pdfIn PDF document text
    • http://esistore.de/userfiles/file/24891907957.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/31830681216.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a61b6c4e5a---48061114426.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/zumuvelawikadorakekevug.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2f64651f6---61413976886.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/sazuresara.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=langman%27s+medical+embryology+10th+edition+pdf+free+downloadPDF 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_off0000f666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF666 17848 bytes
SHA-256: f3f8307980d172933bb991776c01ce814363f3b7112ff07c3e5ef7960992fcce
font_01_sfnt_off0001248e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CA5 11572 bytes
SHA-256: ff51adce42dc133729f195fd3712ba6159335feb07a353c3e471a2971256838d