Malicious PDF — malware analysis report

Static analysis result for SHA-256 cba0c7e7adc704bb…

MALICIOUS

PDF

72.1 KB Created: 2021-08-07 04:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 215817839e0e996a93b3751bd60f4899 SHA-1: 9eefc771de6c224d02709341071b687735e61b30 SHA-256: cba0c7e7adc704bbeca77d1e0e7e6cf85d15224d99c6f1a634fe7a01341c6d25
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating it is likely a phishing or malware distribution tool. The heuristics reveal it functions as a link farm, directing users to numerous compromised WordPress sites and other domains, likely to host malicious content or facilitate phishing. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6658

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://inwebjor.ru/uplcv?utm_term=quiet+the+power+of+introverts+quotes+with+page+numbers PDF link annotation
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/1e1amjd31d9fj73u931h6ffpql/78138417441.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/pifujewet.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/97ce157be19b0e73b56c97c630c20d4d/pomadelotimagexolirofotop.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/wibuwit.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/35467862135.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609432f9b3255---32867050671.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/4697755c6d3558c96542da4e385836ff/81208255499.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cad08e9a60---61412945509.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/wigofavetotamu.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16076349d3c1a7---82991420511.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/61211735163.pdfIn PDF document text
    • http://landia-print.com/pdir/file/88540011264.pdfIn PDF document text
    • http://pettwayfamilyreunion.com/clients/39389/File/41423708693.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/ginekoruzewogezajojim.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/5576233030.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/bamek.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/21623813050.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/pewojekeli.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/549ad99ccd488578e64a2a713a42e5fd/gibatupigavozaja.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610dd6ee73b7a---newifotat.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/14c4a7266b987e695aec757a901ba6aa/zawameduxur.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610631cd90dca---bofilabewudiz.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/vepagewunamizukakedunogo.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/84599048862.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_off0000cef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF0 11356 bytes
SHA-256: c7c2b0a69259000b4218d52f9d2deb9b2a887372378873e8a7b1db28f2d1cc86
font_01_sfnt_off0000e924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE924 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1