Malicious PDF — malware analysis report

Static analysis result for SHA-256 a89f46c3430b3452…

MALICIOUS

PDF

70.7 KB Created: 2021-09-21 12:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 2306b712bc9f154a955bfbd0dae4ee0c SHA-1: a207f878765d060d882c65aa1b652b3f93bd9f56 SHA-256: a89f46c3430b3452dc18ed36a3b816198b093b97be1ace8f7c3b12810f70442e
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript and multiple URLs pointing to compromised WordPress sites. The ClamAV detection 'Pdf.Phishing.Trojan' and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a phishing or malicious redirection scheme. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4270

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 http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5230764a9---42599522858.pdf In PDF document text
    • http://chouchouphuquoc.net/upload/ck/files/jukuxotavanugegib.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138b88992f18---jemalerelebunatonodivaj.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/tobofavudevepesilemevur.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/pifokitodosotoxem.pdfIn PDF document text
    • https://esvigo.com/upload/files/pibubipedov.pdfIn PDF document text
    • https://tallerescarrion.com/uploads/file/xopoligugusibikufiba.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146f96262d0b---memoziwugodizijogowito.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef0d216294---47265108250.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16148aefae6daf---vudotita.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/81053385175.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/44164075184.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/53975770164.pdfIn PDF document text
    • http://candientushinko.com/images/file/tutasavufotaxefapanubaw.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/79416372715.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/bijivuvuruzavagor.pdfIn PDF document text
    • http://superbarter.sk/media/file/bumutewegezudizixipelibox.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/275398666.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/64292953258.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/xasuwetaviwoje.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/20199167808.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/salad.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/darudosonirafojan.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/kiloverobufenebolojako.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/dobitemuxajakumudezewores.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=renegade+racing+hackPDF 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_off0000cdd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EF 10352 bytes
SHA-256: 3ed0d7c9cc1d6efe7ee0e932f0c0d8f144278bf4e227ad31f072b8c1062b7a41

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