Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd14365e11b02261…

MALICIOUS

PDF

75.2 KB Created: 2021-09-10 04:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8096649a703e8c50f0012c972ae53370 SHA-1: 998652828c0ddf7eeb29ef71e3a02962985603e0 SHA-256: bd14365e11b02261a9771da136fd3539c18dde209d2ebcbc8ec0a6dc77081bb9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable hosting or compromised CMS upload directories, indicative of a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns align with common techniques for luring users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://limberhurstgallery.com/imageuploads/file/31474892136.pdf In PDF document text
    • https://groupunsur4.com/contents/files/52060907621.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/xojuger.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/76958070016.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/mipiguvokipusiwowirowore.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/febomepet.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/wenovipozaxakebigisugidib.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/11257641999.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161315b07077ca---57299415274.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/080219333303.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/noduteladivixug.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/wewovakimupinavofezeziteg.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/30271266924.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/77092738308.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/zaragubasepinam.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/laditoposila.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bf7339ff8---kaluvidoxenaxupovagu.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/74665993865.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/doguweginijagumawogaxaj.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/13676060427.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe1073b58f---livum.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/69416611033.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/57783204550.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/eafqhd3mnoa3ef766e8rkgg9gg/44078301586.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=minecraft+apk+download+realPDF 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_off0000c29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC29D 10616 bytes
SHA-256: 9bf09cbd092be3ea5fcda68da2b9fed200d86e89d04d920149d47e6d1fb1cca6
font_01_sfnt_off0000db0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0D 17328 bytes
SHA-256: 4a9d4a3970946e78849a04a8430f56f8390a88af038c61e2381b5bcfbba8176c
font_02_sfnt_off0001075f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1