Malicious PDF — malware analysis report

Static analysis result for SHA-256 f22c1ea656aa6ff7…

MALICIOUS

PDF

67.9 KB Created: 2021-09-06 07:22:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5f4cb5669a0869d65bdff372ce498d18 SHA-1: f19b13b16dd8b8b654c678cbdcafcce331c5ca94 SHA-256: f22c1ea656aa6ff76ea312227174b3a38dc63676fa41d3f381286838419c7457
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised CMS upload directories, suggesting it's designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a malicious document designed to exploit users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9158

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 http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4cc7bfa75---kejegijisubop.pdf In PDF document text
    • http://mathcountsoutreach.org/userfiles/file/94209370798.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/a2fac73d9a0313262f9929d06fe98efa/tomisepibumulenuputex.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/766259008.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/0102ab3749ff82da1b6eaee017941ff4/papuwovasu.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/8qon6mqn4everasuht298r07v5/29414322316.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609efcdd0d675---17180846364.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b56ea55f3c---kadorikeja.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/dekudenavolaxaj.pdfIn PDF document text
    • https://domilot.com/uploader/files/nobax.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b11fb3e4e06---fizofidira.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/85859f2b0e90bedd2f8ef22943550f67/80283633155.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/36357137106.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/7377709797.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/00c7287461e7f6311f6cc59a91b4e389/siwesol.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f67f9378ad---64136552887.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/1r99l9coedfh6c5cquqnrkv9vv/8832148463.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/83012330506.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/zabivatekusukasemoju.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/51346676628.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/be399f16a8ebec36ec21e9d84f072d79/91467795434.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210708004807.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/26140889954.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=combine+jpg+to+pdf+windowsPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD798 10920 bytes
SHA-256: 5b52d26924c2f43cab283a47ce3342affee57f7dc4fffe2f0a491767d27660de