Malicious PDF — malware analysis report

Static analysis result for SHA-256 a583f0a8c5a46ab0…

MALICIOUS

PDF

82.4 KB Created: 2021-09-19 00:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 4bd3cbdf80851962dd3c8d105186e24a SHA-1: ef6a644479c679abcb039f0751b1775ca6dc6402 SHA-256: a583f0a8c5a46ab0f1589bf98d974f420e4a2f020b5eb334412f33dbbaa86a66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://inwebjor.ru/uplcv?utm_term=device+not+rooted+properly PDF link annotation
    • https://keongracun.org/contents/files/61639749511.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/66999374567.pdfIn PDF document text
    • http://rilta.net/userfiles/files/88132237393.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327ef93f30d---jakuladukanofegugurawebi.pdfIn PDF document text
    • https://kondoreskiss.hu/term_extr/files/doxiguliz.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/wasufilejujemikaritet.pdfIn PDF document text
    • http://moristas.com/userfiles/files/sevaja.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/tavejesipokatefexosefuj.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/32674602392.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/64643210366.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/desonasinonalazewoxuvif.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/51158686994.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/luvuwozojenazuruxud.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/19561953501.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144c3ba5fc12---wikuwimebugojediwo.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wegejaxowegat.pdfIn PDF document text
    • http://tianfonmm.com/d/files/27948069107.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/50626642417.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8a55bb508---23430778992.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613df1ba1b543---70910175131.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614003da81037---84003404451.pdfIn PDF document text
    • 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_off0000de22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF634 17888 bytes
SHA-256: 4ea9fe237492d1aa27a137e764ab661f14ae7f48ee448e110f83155ebf5d3085
font_02_sfnt_off00012535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12535 10356 bytes
SHA-256: b1c1d8d06888c5d0436445fccc58f37a55c26293d6ba3f3b43c55764a6a30b6d