Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b93b497a6d292aa…

MALICIOUS

PDF

106.5 KB Created: 2021-08-14 04:38:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 52ed2bd2ab1db61a12ec9adbd4d86ea3 SHA-1: f0d90cbfc6fb210e2ae545a164d8cd26b1e06889 SHA-256: 7b93b497a6d292aa32476d3c9a082f9f4f31abaaa7f13f5141fbe0b4ef8140fa
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised or disposable domains. Although no scripts were explicitly extracted, the nature of PDF link farms often involves embedded JavaScript to facilitate redirection or exploit vulnerabilities, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://baobihungphu.com/media/ftp/file/witevuraketoluvu.pdf In PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/51887563016.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/gquu28e73t5iuqmp99lehtme5p/94485323546.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/17798015581.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/29919494808.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/susukexomasejet.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/29252209456.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/vr178sb14eu09bkhc3du06bic5/508183222.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/8960996989.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607587c1149fc---76840965145.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838ee308d1c---xufevix.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/99845816939.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/60277972850.pdfIn PDF document text
    • https://tepihtrava.rs//files/jikowofoz.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/52020789973.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e3e44b46098---zagokuzatunikukefanizelup.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/42699068008.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afe1a603639---xefigelemixiwaladefu.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/3379b41065960cea5e8513d85020fc33/velusixiwakagitumenaxutub.pdfIn PDF document text
    • https://atl-50.com/files/file/najifaro.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/9480400426.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=resumo+do+livro+o+principe+de+nicolau+maquiavel+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_off00013900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13900 19324 bytes
SHA-256: d5f260fa8eff4a68689b3e0a524f58f800c335586ee7972d19ee4e35e8ffd3a8
font_01_sfnt_off0001681a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1681A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18031 11040 bytes
SHA-256: 2b5fffdfc62e9cb46615b9947807db038174dc5ba7831880084a50c2f0536f68

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