Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a8f07133d13daf…

MALICIOUS

PDF

63.8 KB Created: 2021-09-03 05:41:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dcb12e80ff33f2c4f1b5514bb47bde9a SHA-1: dfc58d676e544772879b1176d6a26339ec054c47 SHA-256: a5a8f07133d13dafcab50b49c996d354f44c9272637aa826d070bc1c57b68a34
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8256

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 http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1c77f0020---73144228303.pdf In PDF document text
    • http://naturallabs.de/userfiles/file/41856459940.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/dudusawe.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/22720790379.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/72689408166.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/48407617028.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/eec400a253cf50e6e205d8a656979958/juropipakapotefavix.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/tenimekogeze.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c04b90e8e33---dilediwokedax.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62310b9dd7---21008471013.pdfIn PDF document text
    • https://laserbeautymachine.net/d/files/54793711914.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/96370108722.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90aa90475d---kigadubagigubibaroxad.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/2b26cfdfc95b9a6c73afa44de7ab634e/jamopizebuvemezaseko.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/xenexatibolamuvar.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/32393582721.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e286b05f6---luzopit.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/guxobomifa.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/58556431958.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/osabirakuvilimo.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/643a0aaec57c6eb06a247f5de0497b7f/52009541576.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=biografi+utsman+bin+affan+pdfPDF 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_off0000d481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD481 10956 bytes
SHA-256: b2345ec6f55c0d82ab31c0096c817dffd95c50ff9a97539ef0c694d116e04af9

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