Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7cd44be70346982…

MALICIOUS

PDF

81.2 KB Created: 2021-09-03 16:31:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9f61e6ea9707e8460c0521da81ce7204 SHA-1: ff541658b2c05a832433f75aea1e6a30ca6694cb SHA-256: e7cd44be70346982dab80efdba0bf487f25a081506f649a2aa53ccdf70db2819
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal the PDF acts as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable domains. These links are likely used to lure victims to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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=anatomy+and+physiology+of+the+female+reproductive+system+pdf PDF link annotation
    • http://upoart.com/ckfinder/userfiles/files/26349723449.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609658f48010a---68592042106.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/17699895139.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608345fb792a5---gediwisexirowubevoz.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/sevesaref.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb19ea89b5---17964950928.pdfIn PDF document text
    • http://medrea.ru/upload/files/58801659162.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/57882648249.pdfIn PDF document text
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/60374017930.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160873a0ad5145---36177378657.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/5163778305.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/5s78m9hft6730guji60oepahda/vujekimijitijirusite.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/f765750ee6572b9fb512ccd542deecb6/lekapabejodujibiroman.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/fupofevelodojoxavi.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021051523352318.pdfIn PDF document text
    • http://huiking.cn/uploads/file/080631409093.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/35079902108.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a892ea3fcf6---venapilupokutizarujawud.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/7m2q3rfb63q7lqeo6r87sq5j8p/55712364945.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/a540cffdb85d28d031c1f474ffacec9d/wiraxafunefoxuridino.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/pavebevezunadepekar.pdfIn PDF document text
    • http://www.hcc-cpas.com/siteuploads/editorimg/file/84028460440.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/f3a2d577111f72dd618bebf868048bdc/vakosor.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/zexotomibavejoxu.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_off0000d95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF171 11328 bytes
SHA-256: b4b8bc611ffaa80f17613d8599d26d275b439342397b31b77fb5e21a57b2c22f
font_02_sfnt_off00010bc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC7 16920 bytes
SHA-256: f78323b16375eaf05fa670aa5a56579ba9d2b0f3fe16b4b9f66ac0ab96f04fe8

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