Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7eee1bafc6f48cc…

MALICIOUS

PDF

78.0 KB Created: 2021-08-22 06:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e0aca4f5cd6b4592093bd793ebaef231 SHA-1: ca08ff30cbb8f5772f6f6bfa45fdb1bf6d55309f SHA-256: e7eee1bafc6f48cc752935619f790c2efd6dc9841e59309372c49f443be432a6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that exhibits characteristics of a link farm, with numerous URLs pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5182

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 https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160e2765332ba3---74777000979.pdf In PDF document text
    • http://impressivetravelvietnam.com/upload/files/65805667133.pdfIn PDF document text
    • https://12shio1.com/contents//files/64733089936.pdfIn PDF document text
    • https://songhongresort.com/img/files/2657850794.pdfIn PDF document text
    • http://hidropro.hu/upload/xakafisojixisiwas.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/9187825820.pdfIn PDF document text
    • http://debden.org/userfiles/file/43870847044.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/boretudelexujemaminemigav.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/68142cbaaecec462e4f5e77ac6a0ddef/lutapodilukoxev.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///rigeduberezibane.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/83890770328.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/8282373e08d61f21f89e068d9d2526a6/27052738437.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/deb1c6bb1aa524775b26a99d04968b51/patoroxaviriv.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/40881196527.pdfIn PDF document text
    • https://soechi.net/userfiles/file/vojovoxepikazuw.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/61682772764.pdfIn PDF document text
    • http://apricomm.com/userData/board/file/jukado.pdfIn PDF document text
    • http://bogieclassof67.com/clients/71235/File/favefa.pdfIn PDF document text
    • http://hasyo.net/files/file/36052938630.pdfIn PDF document text
    • https://schmitz.cz/res/file/tepirolegujilumatexax.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-9/20210509131905746964.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/2868bbbba1719e9fb513ead50be9e369/gujakebadugomevovovakikep.pdfIn PDF document text
    • https://summit-christian-academy.org/scauserfiles/files/lanumawopelikisi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=kan+ve+kemik+2+izle+t%C3%BCrk%C3%A7e+dublaj+hd+tek+partPDF 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_off0000e25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25B 18308 bytes
SHA-256: 823ffc8ebedbbd3247b55be0066d2c95b2cad1146ff96e506cf8f15d54135361
font_01_sfnt_off00011044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11044 11456 bytes
SHA-256: cf88b86b31628362c35873c0505ecabea4b0d858951c0597618b406347bda5fd

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