Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc3cd3b27c2f8126…

MALICIOUS

PDF

75.9 KB Created: 2021-09-21 08:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9ed5547cc367fcb53783bb06dc44bafe SHA-1: 5538ae30beefac8003b0d42d888752c1c1ecec74 SHA-256: bc3cd3b27c2f8126478e325371ae0f6bf5f785bb604caee1a797fb466cb2ffde
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links pointing to various domains, many of which are hosted on compromised or disposable infrastructure, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's designed to exploit users by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/vibapazeluwijivudupukafod.pdf In PDF document text
    • http://simpelms.nl/userfiles/files/zodasigedejunulo.pdfIn PDF document text
    • http://afro-safari.com/upload/files/witepuwigomekodavoxakimu.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145c194c7c74---lizusomukebijepozafepi.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/78200506709.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/texapono.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/68997456441.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///faxofitekazojeseg.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/dabavesudogawovuxokijigam.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bc51903af---nufisig.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161487030b7380---9090600852.pdfIn PDF document text
    • https://istanajp2.com/contents/files/82327269505.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090910532291759.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/98225648849.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/zuforexefosu.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/lajevu.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/67518048581.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vetademopimogefelasi.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/xezinudas.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/lixajasaduduxetikugiwudi.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/6172597294.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/domigafaf.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/dimizegufumuxuwipopama.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=gta+v+roleplayPDF 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_off0000bf46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF46 10100 bytes
SHA-256: 8c9e38b40a29c5f847fe39ff3ac2f708173bfec09739d148cd27a1e38a456ee7
font_01_sfnt_off0000d5fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FE 20040 bytes
SHA-256: e41c57a8dc6c26b7cdbcff580dc6c14c4a3d214cdf558a7186b11e7049adf554
font_02_sfnt_off00010a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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