Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9773fc8295e78c7…

MALICIOUS

PDF

77.2 KB Created: 2021-09-06 16:37:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 324e8c4955e08a651e886da9d0d069e4 SHA-1: 5e89674aeb119324a4e299b79a169657033a32ae SHA-256: d9773fc8295e78c744487d9550566541735e3a70a91ca0297a2c27fba13889c5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various domains, some of which are hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure and URL patterns suggest a phishing or malware distribution attempt, likely using embedded JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jhroseclassof77.com/clients/45984/File/newubamirepajerapabuxuz.pdf In PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/4325660473.pdfIn PDF document text
    • http://yoron.net/up/files/5169493436.pdfIn PDF document text
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/fenar.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160c40790e8810---69909437844.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/mo67bggbroh6cal2ephdnrjdrh/24895621850.pdfIn PDF document text
    • http://xahuaheng.cn/userfiles/file/wenena.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/99407496665.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/25411580852.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/selus.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/mazojanevolabupesadesij.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/19655984446.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/84475874741.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/76186240556.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/64570720829.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/879e22f2aff16c2c35929eb952174dbf/keselav.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/40976113597.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/6580402347.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/l98ub10ks2nrvj6t2qgct2g715/9993636387.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1611dda384a7d3---konemamusuwunusoripufe.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/fcb2314cc7f278f44fe0e9de6f94d0c0/pufutefixeva.pdfIn PDF document text
    • https://transit-connection.com/userfiles/files/lodidelupul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=renewal+by+andersen+warranty+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_off0000c8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B4 10664 bytes
SHA-256: 0126f547b32afdeb5ee9649baf431f649d2bed48105a9172339d917b16dbe1b1
font_01_sfnt_off0000e125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE125 17512 bytes
SHA-256: ca841e3c940cd8495882c77bc59969d40c481311c707166e9bc3332b316a5c7d
font_02_sfnt_off00010ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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