Malicious PDF — malware analysis report

Static analysis result for SHA-256 66912b90fdde04f4…

MALICIOUS

PDF

79.2 KB Created: 2021-09-01 02:30:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 19bb85a304ceb77ea40197bdf683f188 SHA-1: 3cd98fcfbf71bff00d30faaa73cd3888b2e4f0fc SHA-256: 66912b90fdde04f4d75209ec48b4151b59d476345d5579eb8adad3ab9dd3e8cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the links and the PDF structure align with common techniques for distributing malware or leading users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://aircond.md/upload_fck/file/pofegoxexunamekuj.pdf In PDF document text
    • http://chrislahoda.ca/userfiles/file/fuvaniv.pdfIn PDF document text
    • http://cgemfoco.com.br/ckfinder/userfiles/files/74617915717.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/d8ed63ff8203f1c137ecfbbf27464b84/53243887864.pdfIn PDF document text
    • http://skyline1968.com/clients/74864/File/6897688479.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/32087173628.pdfIn PDF document text
    • http://boldogelet.hu/media/79230346898.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/e2116876660643487b23ead9cbc5a9a4/lojelif.pdfIn PDF document text
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/56147310502.pdfIn PDF document text
    • http://ipayon.com/root/FCKeditor/file/faxetabavovirezezozipo.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/th8lv5rvhduphigolareh89sq6/zepukepiduguvek.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/tosora.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/36481210618.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a4859e62bfd---13716421806.pdfIn PDF document text
    • https://micsys.in/userfiles/file/1042037807.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/rirupe.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/514eba8f128aea1f806643a6368af7e5/puvaziwawaf.pdfIn PDF document text
    • http://whatdwellswithin.com/file/69013907467.pdfIn PDF document text
    • http://idcla.net/upload/files/funegufovorojeposopupoju.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/02td462lnj6iprt1n7nhmnd2ld/92528713711.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210801145600.pdfIn PDF document text
    • http://scottleddy.net/clients/862555/File/67754166375.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=fundamentals+of+data+structures+in+c+2nd+edition+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_off0000ca3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE255 10976 bytes
SHA-256: 375f7924a54ceebb358a97c5da6bcdaf6cd0b2c2d1ae4c3462ca67adea236489
font_02_sfnt_off0000fbd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD2 18508 bytes
SHA-256: 21cd201deada6695b1838a60fcf7566e570e25fab7405cb039e243f7f81eedcc

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