Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f096b253480a5c2…

MALICIOUS

PDF

91.7 KB Created: 2021-07-07 02:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8fc45cea5fd079304a57c72bd0aad8c8 SHA-1: 1029c95965d24233cc7ede05ae423859203be08a SHA-256: 7f096b253480a5c2b04a4f55e1a0b7700ea8517d721f4f69c34aa52f4af30996
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other disposable hosting. The primary purpose appears to be directing users to external sites, likely for phishing or malware distribution, leveraging a common tactic of using compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://studiotecnicoarduini.eu/userfiles/files/18769100258.pdf In PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7b61019e4---49383232618.pdfIn PDF document text
    • https://invest.pl/userfiles/file/59140561232.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a184a6a98---tijanazezutirilivu.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/2ed327f7c6f7ed0f1f20571fc442bf34/mikadezedag.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/20893018365.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/42240087943.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea0273162f---57596846657.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/42451180660.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/30051463664.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/64427027280.pdfIn PDF document text
    • http://soles2walk.cz/data/file/99184378403.pdfIn PDF document text
    • http://armanetti.com/images/nuremofoxek.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/4e9ad49edc1ec8802b16f988626647c0/sakidavizemamomet.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/10217225337.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/31747400612.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/2d25cd0790b5e952956d4690bbc0ed3c/soxugufuxuf.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bddafbd774b---ganozutizukigobexufifu.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/guwedewezukagorupobo.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/wakuruvusafolafujovi.pdfIn PDF document text
    • http://amandamaitland.com/images/file/84400340538.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/32231613066.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdba3c229f---berusasovoji.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/ltqqat4ccia2gvabtkcu4r1s1d/luwirudezovunaderisarot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=write+your+opinion+in+3+paragraphs+about+the+given+issue+belowPDF 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_off000103a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB3 16700 bytes
SHA-256: ac8933e4bf75ac08b8e2fa4a69013717a699853abbc2b4cbaacbd45b073b9a0d
font_02_sfnt_off0001471e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1471E 11200 bytes
SHA-256: 76935e43b65880aa23ca92e97238477e5f06751139dc26c55e219687f1d54558

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