Malicious PDF — malware analysis report

Static analysis result for SHA-256 e966de0c26621dda…

MALICIOUS

PDF

78.9 KB Created: 2021-09-03 02:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a0a26dfc4f44e1756d15842cfcfba153 SHA-1: d9448bcf32ef9a9979e4b26cbbc7bb783fd997b6 SHA-256: e966de0c26621dda3697b65fdaa245d8b71bcd21da5b6e4b6b890b6b02cad52f
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of PRC/3D content is also noted as a potential indicator of exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dccaabef7c---mebapapemikareladupujagug.pdf In PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/9dbb4310d9f4fe139e08908191c08484/nuwatawogadagifojokeru.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/93785935827.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de86ca2cd95---numogusuruduwojejabo.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/en5sbjpj968m6ocg223psuambe/20130439349.pdfIn PDF document text
    • https://ms02bet.net/contents/files/55225086062.pdfIn PDF document text
    • http://spearmanhsreunion.org/clients/e/e1/e1754705b4c076d7cd520c5e9e79ed07/File/muvozokovuzuritalulosig.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/fopunex.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/29866999039.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/javusamurajivamafagutezi.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/sebedelaguk.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfafce690d9---zopazotazuragevododuka.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/ab14c3f6bfd7b3653cda72de20ba4a99/lafitemavevuzumoxexulofi.pdfIn PDF document text
    • https://invest.pl/userfiles/file/58101573676.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/27002247682.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/2684646443.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/bogojonuxixukuxozasazovag.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/romojixav.pdfIn PDF document text
    • https://cooperspick.com/files/kodorawixalufemukixebobej.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/bumefam.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/93898143708.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-07-31/images/files/70922736635.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/6ou73mhi9068lt079sjfcv3ai6/94840880869.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/5817996344.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=adobe+pdf+writer+editor+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_off0000d341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD341 16632 bytes
SHA-256: 6326e6be7de1bc78bb0f2fee0917172bd1d5b7a054c2c929797da400baf53796
font_01_sfnt_off0000fdb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB3 10532 bytes
SHA-256: aa2f1a23c49f70c9b572b6b5d7d80803d00b3e866555ad75eebda376fde46054
font_02_sfnt_off0001159d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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