Malicious PDF — malware analysis report

Static analysis result for SHA-256 c80cd982a12b6b13…

MALICIOUS

PDF

78.1 KB Created: 2021-08-12 09:16:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e115e8922b5c5cb7b8a97d7a7cba8863 SHA-1: fc104a4e37aa09dc68cd48fbf210f4ade2dfd398 SHA-256: c80cd982a12b6b13bc71d4e786c309ba01b7ac1301e358120e457917dcdfb154
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://wecans.net/_UploadFile/Images/file/41784651035.pdf In PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/71441ed3c13820fdcc371f2bb5682f55/vetita.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084b02e92b12---viradof.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103415672653---zafewisivoridilaxetabi.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/94608226219.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/dupuzosew.pdfIn PDF document text
    • http://suapaiatuipelehakefamily.com/clients/80707/File/sujukov.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607142939676c---24395318205.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210605004413109.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0e3d6a6ec5---22335853913.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/97767912600.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/sukenu.pdfIn PDF document text
    • http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/69017896489.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5dfc553bfd---bixiduwezevevuwekasujo.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/08931e10cf2fcf4cb8f696ca424ad704/78499943584.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/xafomefuzuxuzusadaxafil.pdfIn PDF document text
    • https://pmms-online.com/assets/file/77323667906.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/fopema.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/53445907244.pdfIn PDF document text
    • http://thecreditcrisis.net/clients/73966/File/korevodezax.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd2c461da9---41282031912.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/q35p4icvbi2q3ionrr50pi58rf/wudunerovotizezafizi.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/71227973533.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/83032205619.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/dodipalutado.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=tomay+hrid+majhare+rakhbo+mp3+song+download+mahtim+shakibPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC172 11536 bytes
SHA-256: c0fb069206aed0931f5b7c3256830f23154d0fd5e159ed0b7a2c5c7fd32aa12b
font_01_sfnt_off0000dc36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC36 16872 bytes
SHA-256: 8add145717136b877c17acf840626e6c0ddfa08e95db0d39e44fd9e58a609847
font_02_sfnt_off00010880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10880 1984 bytes
SHA-256: 0c20e40c39c2025c74499dfb6944f2702c752e1cf95cecef51bc3995e4aa24c8
font_03_sfnt_off00011197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11197 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1