Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4b7bc0b9edbd406…

MALICIOUS

PDF

63.5 KB Created: 2021-09-17 13:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d6298a01f79194407d2646891da367d2 SHA-1: 764b989caf4628329431750358fc932b3867baea SHA-256: f4b7bc0b9edbd406405d337a207192e5f70df4ca860bf538baa60eb8ca791fb1
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a signature indicating it is a phishing trojan. Heuristics reveal it functions as a link farm, directing users to various domains, some of which are hosted on compromised CMS platforms or disposable hosting. The embedded URLs, such as 'https://philabc.ru/uplcv?utm_term=moya+app+download+free+downloads', are likely used to distribute further malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4663

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://philabc.ru/uplcv?utm_term=moya+app+download+free+downloads PDF link annotation
    • http://sinocelltech.com/filespath/files/20210904133320.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/torimunemuf.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/78253751669.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/pezaxogojexas.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/13924684049.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/18254717982.pdfIn PDF document text
    • https://indiansecuritisation.com/ckfinder/userfiles/files/33946890430.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1631241883JqmN.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/vowitemidapowebidewi.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/baxopikeluz.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/50470362233.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1630764047.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/pgp0m1rmd0c5b62lftl6io48lr/lifikidupulapazeg.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/20848995408.pdfIn PDF document text
    • https://melz-feu.ru/upload/nonaligakem.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/74071436296.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1cc04ca94---69037202722.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/12418220306.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161443ab6cc1db---96211570632.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/rupijumuwewojafiriwuvebol.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/tadiwenul.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/42621457759.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/49734409082.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/26255242332.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_off0000b9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D9 10492 bytes
SHA-256: 13cccc7cfc12aaa6314849e47ee29f3f8778b1a7d53947c0829bf80a2ca3b5df