Malicious PDF — malware analysis report

Static analysis result for SHA-256 dda7d07ba9a79533…

MALICIOUS

PDF

96.1 KB Created: 2021-07-17 15:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3a85eb35e64a75e7f203ffc8f44ec8d5 SHA-1: e6f81c2ab62c43ee852ecbcadd9f625dcbf738e4 SHA-256: dda7d07ba9a795335d8aedfcce08a02e4707c085a69101320e2b80d54bc41186
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the heuristic firings suggest the PDF is designed to act as a link farm, likely directing users to phishing sites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ac70cacd4---9137305344.pdf In PDF document text
    • http://urjabatteries.in/userfiles/file/3242788951.pdfIn PDF document text
    • http://askort.pl/Upload/file/jasivusati.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1d83c8586---22038240770.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071c0b039f32---baruba.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/93273be04h2mbv05i801qotsp3/rurexebiwituwijusorux.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/7a9d94c8fe21931ca7514b9807da8f6c/tufimapesixenev.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2fe6acaf0---41999471683.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/5280a15fb3a036a29e01c55fd2d30d59/kosolonepibugawotox.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0175269c84---51815593295.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/delutorawewofaf.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/xorezamisilawovimoze.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfa279a37d---65685764405.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/e3cd90d6845fbfd1863dfe118a24b3d5/12321166116.pdfIn PDF document text
    • http://sun-eko.eu/files/file/62791066552.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160870b8e7758e---sujalitutulabovekubuderaj.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/67f324b0033a0307ce4e0a2917a82c7d/3196686943.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/95185827805.pdfIn PDF document text
    • https://nada70.org/userfiles/file/mutojugadilozunufak.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7acdb7b0b---zumuzarogoxuza.pdfIn PDF document text
    • http://tipiland.net/upload/file/93047389864.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/99d31915f0f5925e7fa69fa9a73fe887/84558070177.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/65562890807.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/kudarerurugo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=commission+meaning+in+kannadaPDF 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_off000106c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C5 22728 bytes
SHA-256: c90f078cc60891302cedc372c8828679927b037c9b3b95e3ac6e4c887140d718
font_01_sfnt_off00014234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14234 10468 bytes
SHA-256: c90f2110a347d5f3a5d0df690ea5ba8d349f882ec98d13ec44aa64e0fa64fe7b
font_02_sfnt_off000159c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1