Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff44e1fed1e74905…

MALICIOUS

PDF

77.5 KB Created: 2021-07-18 05:16:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f9eee00aa20939f7d1e4f82512f61e00 SHA-1: bf976a63a4f343892b4334d4c9a3c5e1d3ae4a22 SHA-256: ff44e1fed1e749050814ba8bc402adfbb2f0fb1ac304631aecbb4c2a9b970fa0
132 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to lure users to malicious content. The presence of JavaScript indicates an intent to execute code within the PDF viewer, likely to facilitate further exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4750

Heuristics 6

  • 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.
  • 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
  • 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://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/6ouk07dgtgtatlispsd0hffjft/voneziveri.pdf In PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/sapedamarodego.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b977b9496f1---tijadepafidogasovige.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/denaji.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/zamutilafuk.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/gotex.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ded094b6ea---pogarurajavudubigi.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/9ca07813f2dcbb1097de96f661d063bc/98232031232.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/72930190394.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/78488156709.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160893b38cee9b---2366785729.pdfIn PDF document text
    • http://www.llmhospital.com/www/js/ckfinder/userfiles/files/30657545018.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abaf3446721---30764043702.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089020a57a31---5002946943.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89620944883.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/79225528005.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607036dbacb1e---63752764391.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789f0a396e4---feparizodovobanola.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/3379565158.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38851155233.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160998e46800b3---22874663989.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a3441728763---talopojos.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/37d0622a72d17826e1537b5bc6fbe8b4/zewavufuxo.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/u9rcjm2i9b63snrs2a02h5mt70/88517162557.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=ode+to+the+moon+poemPDF 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_off0000ec65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC65 10112 bytes
SHA-256: f0688a581dbd9ac406fcd397bf73be8cc84b04298aeef5eac610ae9c09ab0c45
font_01_sfnt_off000102b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B7 16848 bytes
SHA-256: fd4387ccce27e30fd90637de5274af977fa1d7be73b7978f29710fd6d8e74d9b