Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf1a5c28d4760e24…

MALICIOUS

PDF

80.9 KB Created: 2021-07-14 01:18:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2d588119c250961e0bf90be0013c175e SHA-1: 52015d9a35b1c59d66f161f06f7a9afbfea3597b SHA-256: bf1a5c28d4760e242320523a89de23d33c86a223c8cd98a36942a46e8fca9728
124 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis reveals it functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user interactions, common in phishing or spam campaigns.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4058

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://pistant.ru/uplcv?utm_term=lisbon+currency+to+naira PDF link annotation
    • http://begemot-rus.com/uploadfiles/file/2021060511494873499.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609826f7189a6---77868607288.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/suveladiludevutib.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/6u9qnu64gr70gjmr57kth2n1j2/wanijaver.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/37014558134.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ace7e2ab2df---gusovomonex.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6cbde276c---85839664134.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/da2f281b4f2303a61fde640b41e3655c/sixurularasifarelida.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/bhehrj6qsqdvegmm2njs299k66/nijulebigome.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/uup70k1gut2cfcpq8sluia035l/rimuziga.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/tekuwubasobujino.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/50848375880.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfb7c5d8d6---91272764793.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a2d72bfa7---73956950012.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1c9ac2b51---jegajusufigosa.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/nopupatetakup.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/gijarewapotupozorukofedo.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/wofopazitamolob.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/memezojulorudexava.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/e6ff88687a5a7f04533b9ec4a6de57a7/77494315002.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/99777445124.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/xoluzogatamexifu.pdfIn PDF document text
    • https://lamthong-marchph.com/piceditor/file/50436034336.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000110e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E5 1696 bytes
SHA-256: 18d4e792ecce3f905fa2ab451ccfd49c5848bf831e68a40b7d1f99915d932e98
font_01_sfnt_off000118fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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