Malicious PDF — malware analysis report

Static analysis result for SHA-256 379e7f19ae04fefb…

MALICIOUS

PDF

58.1 KB Created: 2021-09-02 21:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 5b61b32d709bcfb388065e1ca10e5ced SHA-1: 943ba4c302502fcf2d211b128a13ce0aedaa86d4 SHA-256: 379e7f19ae04fefbbfdef8dd17f2c2dc6a916b6c02080ecdb75e11dbc6e57bc6
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple links pointing to compromised WordPress upload storage and other disposable hosting sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or delivering a second-stage payload. The embedded JavaScript is likely used to facilitate the malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8453

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://taxfirma.com/userfiles/file/64924861108.pdf In PDF document text
    • http://learnersdigest.org/userfiles/file/mejobimudomotujupezukif.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/xavaripunineteket.pdfIn PDF document text
    • http://scro.ru/pic/file/nutebatiku.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ee12ea9aa88---gasanofumotasupajo.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/80003956190.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/cfa93ba9bcc333fd9993b5e613a1aae2/61418569517.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/vafifut.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c48bb7c4c25---90880674675.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/71745373371.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/14275562820.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/23516617957.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/kumetumubixubo.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4b48805f32---48383155619.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/17734950329.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/nawanadakugegaraloge.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/1310997248.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/21051559320.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160b22ba12372b---duliririgojubexozimo.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/43409546317.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/5bdb1841c72a17772cc18cd8b55478cf/80489767371.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/82871928302.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/17550099620.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=artificial+intelligence+mca+book+pdfPDF 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_off0000b8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD107 11008 bytes
SHA-256: feba66e64991c2762be20cb3308241975fc28037f24145c427709696513d4448

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