Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1308f7bb843b6a6…

MALICIOUS

PDF

87.7 KB Created: 2021-06-28 05:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 640e08506d7d5227bb0d757d81ba7c9b SHA-1: 8d100e22afb961e785a08940e61cdb14a90cc787 SHA-256: c1308f7bb843b6a6bab95c1fa66c8f45f45dbd0aacd954cc0830875e6b4ae19a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various websites, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the interpretation of this file as a link farm designed to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://inwebjor.ru/uplcv?utm_term=birds+riddles+with+answers PDF link annotation
    • http://anhopphat.com/uploads/files/jebuzurexamavozaw.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/rukemugilimemuw.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0eff84d54---33482132783.pdfIn PDF document text
    • http://aimic.com/userfiles/file/kezununanawomo.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160965ebd7c263---76690704333.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/hne2qdh2qto2krr4l3qq69tun4/sinamo.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/timuredexirad.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/67231995073.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/kexekirababiwodinutosesam.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/ec7641b5990da4a642d2db66c2bd7a38/85644972815.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bb1cb61ba---subowenasazobilolutun.pdfIn PDF document text
    • https://chogmai.org/ckfinder/userfiles/files/zatupusesin.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd516e7073---5057139106.pdfIn PDF document text
    • https://loctra.net/userfiles/file/14258787556.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/40061735795.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/ralakazojovuverudaviragu.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/tukokifobuzusokomonijon.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/905f3d7c4c29d0a69511217b1dffcef3/medajenezoputukerakes.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/gowusojawufeve.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d50e12aaf8---83040055708.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/280b6d16513f657f4153804b79048f13/69829509172.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/78329784955.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/zixusobulateledegobabaza.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_off0000f5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC3 10364 bytes
SHA-256: b5e54ccbf205d87768db26bf2c4dd388958a67fb02f36ccd21f112bfd08e96e8
font_02_sfnt_off00012526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12526 17108 bytes
SHA-256: 19233e779f62230507e454e34d5662625f92fc6725cc6d9747ed46dee99d8657

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