Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fe3f6b4a49a8866…

MALICIOUS

PDF

81.5 KB Created: 2021-09-06 11:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3c9398bd69f984454e717641e7f446ec SHA-1: 4b1f3568cad78e8af0b0479639e88cdb1a223a2c SHA-256: 4fe3f6b4a49a8866842a4f1432dd8fe207baf002f4d48988eab4819bae0f4e7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, many of which are hosted on compromised CMS uploads. The presence of embedded URLs and the nature of the link farm suggest an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c77cc670812.pdf In PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a238c89d52e---muwomekozewuwelajiwi.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/91353714075.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/59354040507.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/48560208595.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/0d1bd1ceed37cbbe69163d48416a8b0a/22274899871.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210903200432.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/wirowogujido.pdfIn PDF document text
    • https://rjpexport.com/files/72214924928.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f93bd2ced6f---5811105318.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16097b8b5936cd---figebetakodojuwaralasol.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da8900cf3f---24691519779.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/vhb46qntp8bq5dqlilm0lhg9m6/rujofe.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ddda8e70a9d---wenugimabut.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b2f105633---feziralasuzutawokuputetal.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/forofodekodeluloku.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/vixenamipibavaxefox.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/fegularejogukenumosu.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/fonilug.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cf027c160cc---74195804104.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb74d0a6d8---zajaviredobovore.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16089e794d433f---luvagipubugerazu.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f848d6749b---lofesa.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/a705b26f8d47628eef618d9949476b9b/wotegobeviri.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/74755775285.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/texubalolaripubikox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=four+corners+student%27s+book+2+pdfPDF 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_off0000cf36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF36 10776 bytes
SHA-256: d0e2cc7842921c9b17149f1db16e16ab887faa79048ed84688ceed8c4ef0f698
font_01_sfnt_off0000e808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE808 21488 bytes
SHA-256: 3a1da76b32acf6ede78ffca2e071cb8aa3514f85830f1f0e0796e558b6530df0
font_02_sfnt_off00011e74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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