Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb5954458f690f8e…

MALICIOUS

PDF

88.3 KB Created: 2021-08-31 00:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4b79679058055ec0d53c0428d99eb57a SHA-1: d31d8d57818926ff7af3300564d8baf1aab4122b SHA-256: cb5954458f690f8e4240d6154d0a463afb05a87f6ec69deb84288c9d14e813fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, with numerous embedded URLs pointing to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious content or facilitate further compromise. No scripts were extracted, but the presence of a link farm suggests an attempt to distribute malware or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9884

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://oniceh.ru/uplcv?utm_term=the+crossing+connelly PDF link annotation
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0a6fa248b---lukagakodibaju.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/79674235861.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a021bb912e---34302213076.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f23b82fdb0---zuxixujuwamojoledosipigus.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d287ac4003e---58901489202.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/kilinifinezixuxoz.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49316920481.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/47211d6abcd1a769517fd259fd23af0d/nidutajotuzufobonefak.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc94c28db0c---20201290544.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608224a87d163---sevolufotagonetalibowexim.pdfIn PDF document text
    • https://wodgluch-projekt.pl/userfiles/37680504076.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/tapuwunaruzamotizofowit.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070d612d3d25---pogubakopijawutomakim.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/bedemiwesagomijuj.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/xekugobojara.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/345765342.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/11b4f3e1e94127d74104acd9db62bd0f/xowurifefute.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/37317510379.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/71224831864.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/xexeru.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/wijorojoderuzoramasa.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f56813cf6---32748131665.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/36513528759.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/83585303002.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/bozopu.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/12828586544.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905d7d79105---86776716598.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_off0000f344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF344 18896 bytes
SHA-256: 9e63fa759e0f6a8226cbbb22d13a0a6268719010059739cba0e3d5c037b70082
font_01_sfnt_off00012430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12430 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C47 10328 bytes
SHA-256: 72b1e031b02228657aae5e854d5808a27ed1d2f4afde436d5840337624fa8d20

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