Malicious PDF — malware analysis report

Static analysis result for SHA-256 bde3fa9d48cb2160…

MALICIOUS

PDF

80.3 KB Created: 2021-09-15 20:42:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3c1b1c4efd197c3f3da09d1b2b57c464 SHA-1: 12891355fbe64712f7a397469b44735f4a2fb2fe SHA-256: bde3fa9d48cb21604356b23bc57ac939ac1e18b9be67b1a07dbf973a0275ec67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV and an ML classifier, and it contains numerous embedded URLs. Several heuristics indicate that the PDF is a link farm, with many links pointing to compromised CMS uploads and disposable hosting. The presence of these links suggests an attempt to direct users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613267fcd98f7---mitifu.pdf In PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/fagojudeji.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/29565274956.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16137ad33ef13d---40803513816.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/xatuvogeluvanilej.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/99663371985.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/10246619818.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1630875048.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/k2a2769s00dfcv846491ht5k51/18794433668.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/xamigoferunaxibop.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16134c24818658---vusebabelixaxibam.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/neranojeduzatotigilifik.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/99252221122.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/xanivodusamusogopef.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/57796993644.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/lexejipisage.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/1423167022.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/nulebupekadalovizaketum.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/xelufejekuj.pdfIn PDF document text
    • http://rococosofa.com/files/files/97457294224.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614203bfbb269---wiwadixut.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/kozabadanudutawob.pdfIn PDF document text
    • https://gornjastubica.hr/files/kunagesikuvigovolas.pdfIn PDF document text
    • https://servauto.fr/img/user/file/xajiwifinopegewezebibogur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=auto+followers+instagram+no+loginPDF 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_off0000d625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD625 10724 bytes
SHA-256: d14bad5df829e78f7c6be8432cd84da120d944a4fbc46f409c4925a2552f8d18
font_01_sfnt_off0000eedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EF 17356 bytes
SHA-256: d40738c23c527bdab84d898dea8d0518ae3877243f614a95d5573ca5c9542e76

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