Malicious PDF — malware analysis report

Static analysis result for SHA-256 846b8e2608c53c01…

MALICIOUS

PDF

56.7 KB Created: 2021-09-05 02:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2c0b41ca54eb56bd309feac0f79142a2 SHA-1: b9e8269881b07da07833bbdd0d207d21eadc4ad7 SHA-256: 846b8e2608c53c01b9c7b35450ed9eba0f61a091f4745a3bd53bdec5ffa00ca5
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript and numerous URLs pointing to compromised websites and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8068

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=nctb+math+solution+class+8+pdf PDF link annotation
    • https://bloomland.com/sites/bloomland.com/files/gemuluj.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ee77a6d29---doxukutazugamugavori.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5c191e498---33372471438.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaa63cd9fc---30446336869.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210813121712.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/tusefap.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608239116d53e---jimiwawob.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d2212171ebf---24684880584.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/fufotugazipotosatas.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/98388359860.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cc4a1e641---70543950.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3d541cb56---38828556998.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/97042650291.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/12885139.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/67668851881.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/8554908504.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/28555746137.pdfIn PDF document text
    • http://parilka.by/var/upload/file/xogamumunepibin.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3eb073da2---52054925883.pdfIn PDF document text
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/61972665333.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/78779022980.pdfIn PDF document text
    • http://www.toptehnik.si/images/kofipifasefukomesigonuker.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7226ca5b1---delapadafurefuvalebamuf.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/movadepijovef.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/76489124443.pdfIn PDF document text
    • 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_off0000cc6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6D 11076 bytes
SHA-256: 82164ee0dc8963b9767a5a7aec15f9f63a624b2e21dba51bd1b0abfa6223fc62

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