Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ae8f709cbf7623f…

MALICIOUS

PDF

85.8 KB Created: 2021-06-30 07:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 93aeee625cc36bdfcc00a22ded854d73 SHA-1: 28e24908265920d43b920919d1d3e077c42a90db SHA-256: 9ae8f709cbf7623f128e59c5d3ad36dc35023d4568a7ee7677a6e20530e75c5d
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads, suggesting it's designed to lead users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm structure on disposable hosting, further supporting its role as a distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://archism.ru/uplcv?utm_term=look+just+wanna+tell+you+that+your+one+of+a+kind+lyrics PDF link annotation
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c97f535efe4---92414076365.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/75717342764.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3fcdc0af4---tafebezodikarogexatav.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210620_9D1AEE872F726BB4.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/68252327640.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/3d0b64cf9016dece678a64d5a89d6e03/nadikinegig.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/010aae3157701cb12fc4d3c374acbd07/zijosekabunosemobenox.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724e9ad203b---62534266490.pdfIn PDF document text
    • http://msiutilities.biz/documents/repunizotiz.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/39561984798.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ef04715bf---41376390332.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/63021684595.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/9ej477gnhed4m99hs8uce61rd1/viwabadexikedegesos.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/59390f1cbaf730360dc88e72d520125f/suwexulemutunimuvomad.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160c88a4417208---zalokuzamologevisalok.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/dovitapinamavefokowow.pdfIn PDF document text
    • http://apvn.info/userfiles/file/sidinuzamizezepizinateno.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160948b364738e---lurutegukofogilesazila.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e58f0d3846---keferakovinonukaratajo.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/16798707420.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/106605562260afe1b5d9716.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160944c651f384---73359234202.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16076b831623fb---kununujuvo.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_off0000ea28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA28 11052 bytes
SHA-256: 4fe480b069516085eadf3a3cc05fab459c262368d57974dd124199eff2f2a82e
font_01_sfnt_off000103e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E6 17376 bytes
SHA-256: 70bb2471382cab19a82820c389b71e225a2d96e1aa708ca7de94cf55f315077e
font_02_sfnt_off00013168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13168 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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