Malicious PDF — malware analysis report

Static analysis result for SHA-256 f15f7c31e304a6c7…

MALICIOUS

PDF

74.1 KB Created: 2021-09-04 19:05:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d316b764040366fb4fcc69edd010cc49 SHA-1: f7f50956e6d02bab4c1c03f319bd428d0136d786 SHA-256: f15f7c31e304a6c736fc3de8dfd1281447d933e484b31d5b368ba9b814b5ca2e
172 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript, identified by heuristics like PDF_JAVASCRIPT and PDF_JS, which is designed to redirect users to external URLs. Several of these URLs are hosted on compromised WordPress sites or disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6946

Heuristics 8

  • 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.
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6ddae1bd5---69735744437.pdf In PDF document text
    • http://fotosvatba.net/userfiles/file/fikojamonezetezaj.pdfIn PDF document text
    • http://rrarental.org/upload/file/lipaxavodajitunibavu.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/89785017046.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210822123104_3ggs89.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/fubeketaveletefilojenik.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/vodoviwatote.pdfIn PDF document text
    • https://codecs.roimages/file/dofezovewa.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/331ffae02fde4ad7192394fbd0602629/bapozokizuj.pdfIn PDF document text
    • http://kisito.com/userfiles/file/bujiku.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/lapepisavam.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/a4fcd8151b378d65517bd52a2ca6f646/99905487005.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160874fe1bc859---2255480094.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/lazisiralabadimipenofa.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/jixopowumipelijuve.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/wuxobetilanitejolijatose.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6b7f3ad3a3464d360e242358cfbe4e1f/65732495223.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/43601197522.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/5b477382155e8e4ddbfab1b9c893adf3/kajujavavolejizebode.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083faddd80dc---pobanuki.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/86666641302.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/lezologiwaponiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=homographs+examples+worksheetPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE430 16680 bytes
SHA-256: 6476d2dd92e4735495f8340c9b10614ef81d01ad7f61df45d58ccb43198a8286
font_02_sfnt_off00010f05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F05 10772 bytes
SHA-256: 5d2cd86d8b0fa29e52b5c29c96ca0f70f2733c8349c6a160e0337bac012b1974

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