Malicious PDF — malware analysis report

Static analysis result for SHA-256 d80acd2b16b5ec6e…

MALICIOUS

PDF

86.0 KB Created: 2021-09-15 13:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a4d3c1d2b98289a5ec10f66b095e7168 SHA-1: 50b9c83239a55ece12ab5050e68a26a6252b3e5d SHA-256: d80acd2b16b5ec6e57f5ac26fe590d550738e89854d1bddefbdc4a5419ed652a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. While no scripts were explicitly extracted, the nature of the URLs and the PDF format suggests potential for JavaScript exploitation or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://irlanc.ru/uplcv?utm_term=game+booster+and+launcher PDF link annotation
    • http://beautifulmoda.com/userfiles/files/sitafemabadadanopizojenid.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/rakubowumufibuvudivim.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/202196112734.pdfIn PDF document text
    • https://greenways.at/userfiles/file/36049880053.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133bbc8ebfca---21205651138.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/39bfcca5a690e261afc6d39b9fc1e725/97383899737.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/15256875460.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/12620657527.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/wozatadijujewaji.pdfIn PDF document text
    • https://designclarf.it/file/doluserefiki.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/2608169577.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/luvuwogiti.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021090409315573499.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210910_E4A87540291466E8.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/37938700956.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/zekuxulofugujipivep.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/tugero.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/fixivisadosu.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/30262446199.pdfIn PDF document text
    • https://anjingliar.com/contents/files/99986623982.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/12618206084.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338a155713a---budepodidetepefawarixa.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/xojawedoripomuwujokupaxes.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/pusivatoduzulivipibal.pdfIn PDF document text
    • 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_off0000e80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10020 19000 bytes
SHA-256: cdba57e2640d8b02198abd1f635cd12f22c68e48c7e729605ef2c1aeb2eea778
font_02_sfnt_off000131c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C4 10820 bytes
SHA-256: 9c7ce9e6aab8d40e06306e40b4c557ae8b215d75bf94f931e368011e15353bd6

Open this report in the interactive analyzer, or submit your own file for analysis.