Malicious PDF — malware analysis report

Static analysis result for SHA-256 73124a643b1943a8…

MALICIOUS

PDF

81.4 KB Created: 2021-09-06 13:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9d70c03d7c65e3335c994d9c07051c21 SHA-1: 6c534e595ff5cf294d8f7d89517fb2ca44855913 SHA-256: 73124a643b1943a840a43ab8cfdc64db5a3fdc485afd214deef7f18190072289
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and ML classifiers. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the final destination and leverage potentially compromised infrastructure. While no scripts were explicitly extracted, the nature of the links and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://firewheels.pe/userfiles/file/52883024076.pdf In PDF document text
    • http://hanyangsteel.com/files/fckeditor/file/2112820945611f0399b7746.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/67534775860.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a48bd154e---39939255545.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/dusadasujakesezogib.pdfIn PDF document text
    • https://marijina-romarska-pot.si/userfiles/file/ruzamiridemotobukomuzu.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/50164060378.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/43397347922.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/7043733236.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/161107db818fa1---17876940010.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/pojozuxijigozusejikod.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/finumoxiwarevipuje.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/86837883499.pdfIn PDF document text
    • https://emprenderem.cl/files/64770415774.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab5387a0d5---kuxirotoselilowereb.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/50998831873.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/79114866857.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/26850203910.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/xeripoj.pdfIn PDF document text
    • http://remobudostol.pl/pliki/52189542695.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/zovatuvosefopudasirabutib.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/71308881444.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160893dfee7945---6854933239.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1626368714.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/4631546477.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/kefopapebuvovibef.pdfIn PDF document text
    • http://leton.pl/userfiles/file/pagagijive.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=past+simple+past+perfect+worksheet+pdfPDF 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_off0000d9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E5 10960 bytes
SHA-256: fca3f1165d06538b7eb55d330b1660959bfec406d9d85a48b209e762b9ab01e1
font_01_sfnt_off0000f363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF363 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B75 17104 bytes
SHA-256: ac30c8eaf8004a933f42c06747279b80aba0cc0ec77a71e1f54e9734318742d2

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