Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cecd6dc01d2cd40…

MALICIOUS

PDF

80.0 KB Created: 2021-08-16 22:42:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f9cd744f670e9bfe9489987708314a61 SHA-1: 62065812b8e4aee3c42e4a3525423306b629712a SHA-256: 3cecd6dc01d2cd400ee73296b5decda136f0d256aea89f42b49f03c43e6154b2
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier strongly suggests malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure point towards a phishing or malware distribution lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8512

Heuristics 4

  • 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://crewmak.ru/uplcv?utm_term=simple+science+quiz+questions+with+answers PDF link annotation
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e19ea349d1b---dovelagiputedurituneluled.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743f3c8c421---devuluwevimin.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/32180042619.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/legiposebop.pdfIn PDF document text
    • https://thepainter.asia/upload/files/muwaxagumo.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/60708431001.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160844cfc6bcb0---8041477554.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/aa42d441a3dd84e28ef3f903a5c1d28d/64902587722.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/wimawipemoj.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/e937616936b17fa5fbf3c4ad264bfa57/sevafezotofuxawofanezi.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/cd3b567ea00284ff4bdbad41c2031621/18694500858.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080432c71fff---91391516790.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a24086486c9---63366797944.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095dd0bdbd7e---13469801097.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/131238247336.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cae7ebbcc---kaxifawubokojidomotu.pdfIn PDF document text
    • http://xnucleus.com/members//member_images/files/96730856608.pdfIn PDF document text
    • https://ovth.ch/userfiles/files/8471364838.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b25c9cc84f8---91362710083.pdfIn PDF document text
    • http://geobrofab.com/clients/d/da/da7cd3953015cd63472398095fc1fcdd/File/kafatarolavufajoja.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/25764409705.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/91450515031.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/guxejusal.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5edebf1d1---xifelan.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/junenif.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_off0000f169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF169 16952 bytes
SHA-256: cc967b2bab18ebd240cb9c523dedf0ccdbadc741a03a872b9fcb25eb17599804
font_01_sfnt_off00011d3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1