Malicious PDF — malware analysis report

Static analysis result for SHA-256 284121b453b0c568…

MALICIOUS

PDF

137.1 KB Created: 2021-08-13 01:30:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 818131f07876baa565a054d70775c9e1 SHA-1: 6c699242a44a10967f1fbbfdb1b5cff0c402bda8 SHA-256: 284121b453b0c568dbf11dd2379a5c1f1d8b17505a80a9ee61a3f54c5357ad94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to potentially compromised websites, suggesting a link farm or phishing lure. The PDF structure and embedded URLs point towards an attempt to redirect users to external malicious content, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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 https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f52f29de9a---5149064147.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607493ba80fee---jabobogosavawevutofemi.pdfIn PDF document text
    • http://accessoriesunlimitedinc.net/catalog/file/79855808101.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be82d2dec16---muvewepezuliperudabanuk.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6e80a3fcf---49179289450.pdfIn PDF document text
    • https://12waktu.com/contents//files/vakadipumamebo.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/96474122869.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/3e1f74059fd8a8af5187b3a04f91e337/11631698168.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a8daf696856---67103957206.pdfIn PDF document text
    • http://cga82.com/admin/File/59607254963.pdfIn PDF document text
    • http://kasargod.net/uploads/file/nofaja.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/cddf483a20dfd0854884b70cea117f07/51713620262.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103181a97102---rilovaji.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/f80f3ce5db68c7026348c48ea93a09c9/tedomoditaleluwerax.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/rorirunodejun.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/daspdjuk7i4pk6ij7pqp4s7ka0/xutupabaganegimilata.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/850a61a781a3dce0f11510f62bf0d441/musib.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/87703283737.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/ganidofofobutuguzi.pdfIn PDF document text
    • http://summithighschool1958.com/clients/71652/File/34464123051.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/161002d59f27e2---zegidovidexagu.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/mutumabujuxudeja.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/30791595491.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=sample+appeal+letter+for+primary+school+admissionPDF 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_off0001b554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B554 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001cd6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD6B 11072 bytes
SHA-256: 1414a191eba9f8df5bfb7373a396084cab7556d75cd8eaef161b282c02c6b233
font_02_sfnt_off0001e701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E701 17988 bytes
SHA-256: e4ba3280fd187ab93ab2356f37e4a99dda1eebf38892c1ebca1207d4705cfb83

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