Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ecdd5b1ed13cf5d…

MALICIOUS

PDF

90.6 KB Created: 2021-07-14 05:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5c2da54b1e148aeabaa241cc95a3618c SHA-1: c2c96085ff6265a1f292d387b7b00977b34fb6fb SHA-256: 3ecdd5b1ed13cf5d882a7315913649ddfabbf764fdd37ec46f8e22a2d9ea0f0d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee0a79e7b4e---78773757226.pdf In PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/f353fc035db2a79ac420233f2612fdf3/rizukow.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6ca7b133j28a6ojhdc8964i607/22384826903.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/59947465028.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/gelapifiwonemo.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160abf584ce322---mubejip.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc05495fce---84253131137.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160a982014ef68---dabitefatitij.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16070d0c46f864---73278385878.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c93e3ed159---1554432091.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/zopijitukesiwepinosev.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc41fb9938---16002133289.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ba04bc767---nimukexadodalaripebi.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f75c30d1d4---kiberobalifokekozipo.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/6q4r4n6lt10oh77ar4k9bi7690/46136356613.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f44987bbe2---15146767470.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/70054983249.pdfIn PDF document text
    • http://amajyuku.com/files/files/58794525942.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/a17f98eb463f59516e81e8cbfa9ed1c6/46345407474.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/suwarovutegaxu.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/4mkedtdgmktfb4buagjbs45057/rozenefifawunu.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/93318829226.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/2a1855292c0f481f4596626bcbe0649b/finemulixeworebodi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=clive+palmer+high+court+casePDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/18810189034.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_off0000ff2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2C 17224 bytes
SHA-256: 0f3b24a8945b75690c0999c88a5f0c53a04b58024380f662ed95e70c10268689
font_01_sfnt_off00012ba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000143bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143BD 10916 bytes
SHA-256: 316a4dc0885b180481201bc8919bed4fbe085520cd4240b16157deae8da1e9a5

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