Malicious PDF — malware analysis report

Static analysis result for SHA-256 c58c20ed2f7237d6…

MALICIOUS

PDF

71.9 KB Created: 2021-10-01 20:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b3d16977421a77e9d1dd47692a783c85 SHA-1: 0a8f79cbaac42b36cd42275421022b720948c03e SHA-256: c58c20ed2f7237d635d7c7a85d6fe75ab5d7cc362f9c9995d807cb3982a68dc3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as a phishing trojan. It contains embedded JavaScript and a large number of external links, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The embedded JavaScript is likely used to facilitate the download or execution of additional malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cantarefides.ro/admin/userfiles/file/80372375936.pdf In PDF document text
    • http://hbaoge.com/upload/files/josodetagojijoledev.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161319efa6b38b---58498374799.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/jafawisuvamatul.pdfIn PDF document text
    • https://samudra99.com/contents/files/dotagaw.pdfIn PDF document text
    • http://agrihitech.net/media/ftp/file/4117220382.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383a7c9f685---puzuzofonoxeto.pdfIn PDF document text
    • http://nasledie-sluck.by/var/upload/file/25437061880.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/mitabezifetetil.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/73197751291.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/futubizijibisikajimow.pdfIn PDF document text
    • http://acril.ru/ufiles/files/54155869150.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/28165512261.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/53755726322.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/5610728029.pdfIn PDF document text
    • https://codefon2.solar-napkollektor.hu/js/ckfinder/userfiles/files/gavufiwuzujonomevozavem.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/38210800996.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/55184516565.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/2109250227345175666a4mgg.pdfIn PDF document text
    • http://makaroma.fr/upload/file/78024418330.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210916173529.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/a93a1620a084385cf6691c943a9e786f/majifuzan.pdfIn PDF document text
    • http://hueide.com/upload/files/84195626280.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/nibuwetosotudupujibizur.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/73803310702.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=virtual+dj+3d+apkPDF 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_off0000b5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD7 10324 bytes
SHA-256: 55bc9aac52b19691cd5a3e64bfc38c79bd2140d5602377265f51aceffd2bd008
font_02_sfnt_off0000e52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52B 17460 bytes
SHA-256: b8bd16c6d4839c6ee3c2954d226d6ab975504b2e1874e3e262b0a54af134d530

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