Malicious PDF — malware analysis report

Static analysis result for SHA-256 904a3664a004278a…

MALICIOUS

PDF

70.7 KB Created: 2021-08-28 02:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1f1577575e1f5c825e8a8d0116f59123 SHA-1: 27552464575650e76478c618051190caf4544329 SHA-256: 904a3664a004278a97c1bddf3a814e25ff993c6d9d6fdb08bb9db6d5613f7ab8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, with many URLs pointing to compromised CMS upload directories, suggesting it's used to distribute further malicious content or phish users. The presence of numerous links on disposable hosting further supports this. No scripts were extracted, but the link farm nature is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 https://tonymusic.se/UserFiles/files/2559703405.pdf In PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/5snumr1aqorg517vscfb929bcd/21951659724.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbe6596f6ee---73693457822.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160d455ea3abb5---41742584615.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/lowefedeginitasedakoruj.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/73859775323.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/sevopubaxelurofekavi.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/76440829698.pdfIn PDF document text
    • https://businesslife.com/content/files/54860434341.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/d119cdad58d213fbdd57e70681176bd2/3159522509.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/e240f9ccea58371874e0d4c3e707d88d/13513815487.pdfIn PDF document text
    • http://kimthienbao.com/userfiles/file/sizerenoja.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/8be14adbb38f6ab66431723996c90f0d/zejipapu.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb26345d8a---13241709129.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608450d69c546---mawaxagonedakogagalugor.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/90ebec67d450fcaf1760eedde9f2a676/49052365041.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88007eb516---zuzemisefuboguzevaw.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/6slb3h6720v6qfq8kelrnem1e3/sosafumaramitapafifi.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/dad7f5da7191ac237345d3f4f375391b/99497625686.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/ff833cebbf872f3ad57a05d70a02ccd1/xininurizakifex.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/lozolubun.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/3f17968e648dc9861664f8a515fd55be/bikefeli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=for+better+or+worse+season+6+123moviesPDF 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_off0000b661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB661 14608 bytes
SHA-256: 3e94ec1c6a07f773326c6c36f4841610303612d54fc9ad0270cb3f469c6db1a2
font_01_sfnt_off0000db26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB26 11004 bytes
SHA-256: 91e900b7795e1caeaf16aa2c992e6e3c2157b895fa2b1b6a31e11de09b558f60
font_02_sfnt_off0000f4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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