Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebc8ce8d83c98ece…

MALICIOUS

PDF

74.8 KB Created: 2021-08-29 05:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 4307aae934fca09b1cf904c23fce0886 SHA-1: ced33f1a1c70972803384ce2109552712e41feb2 SHA-256: ebc8ce8d83c98ece96af7ca4f30f2985a55715d4819ee19960366125f6947a6b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5248

Heuristics 5

  • 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
  • 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://guojingmall.com/userfiles/file///tikekupumopu.pdf In PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/10547663113.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/72564172653.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/93320139253.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/f4744a25ac75b24e113705d2122a34a1/7285900356.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/b530ca5963bcd61f7f647ede0ad478c1/lename.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070153214324---sopikagufamulofova.pdfIn PDF document text
    • http://dzbnf.com/upload/file///23920381661.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/3137c53fac9b58ce2bf2d368e24c3af3/27554029406.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/affo96qg794nieqg02n0fqe3cm/49010286989.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/b8e258c4ad5884eaf47b075f5a24cf5b/fejurotadipixuruzovizi.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/lojunirapix.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d76c3588f---dezalufanesegipufixiwo.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160da28dce1fb3---modasexiregoxolumigewinap.pdfIn PDF document text
    • http://shhs69reunions.com/clients/e/e9/e92da0bc0099326815942f81a5c18dfc/File/nuboxi.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/5747432166.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd7acb4ab9---jinofobelivuva.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/79076722539.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098345fce37f---1932856751.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/i93d95jmvksaq74v421rsei2m1/70431685790.pdfIn PDF document text
    • https://bfull.ru/uploads/files/40397558784.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/webudulunilanile.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/gotobixufejexewawazikikis.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021080301043173499.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094b8f46bedf---bisofedoxid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=too+drunk+and+i+fall+in+lovePDF link annotation
    • 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_off0000e14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14C 10300 bytes
SHA-256: e30be790ec0305d7f6b6d6a4be88f6c1cd42b39ed42d652309af9b081eee11ee
font_01_sfnt_off0000f895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF895 18368 bytes
SHA-256: 93a7e93de4036b2cbca39079cf13f15302333cb6fb42900b3ae9e6cf9e010fa1