Malicious PDF — malware analysis report

Static analysis result for SHA-256 af296002d4b40884…

MALICIOUS

PDF

80.4 KB Created: 2021-09-02 05:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 761bfba94b92074fb24686a02725b82f SHA-1: b283f944b43c40810186e7f3a283b0a7ba61d63b SHA-256: af296002d4b40884a555cd11964f616bb1fad4b71e1bb5e13bad76ce70754229
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6637

Heuristics 5

  • 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.
  • 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://er-trans.com/img/produkty/files/bexofag.pdf In PDF document text
    • https://eminesenlikoglu.org/resimler/files/89678732095.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/nuvageni.pdfIn PDF document text
    • http://normel.org/files/upload/file/soridimejotediromaroxufum.pdfIn PDF document text
    • http://cortabellanews.com/userimages/purafuvuwize.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/85970e53d80cf208bbed843d23f01ece/gaxupurinujapu.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/kunijoridotugumabafo.pdfIn PDF document text
    • http://valeneighbors.com/userimages/88395586431.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/60815695247.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/58500999826.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/82988503341.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160782bae2306e---kidapunekav.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609916c246d7d---suxoxoneriser.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/faxobukiwiw.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/i82l710f1qmo3ekekhihfs44cl/zapapobaz.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/91073629207.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a73342d7c0---wadofagojelu.pdfIn PDF document text
    • http://centrumbiznesurawicz.pl/userfiles/file/27220952422.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/rikemerogomuzugerabuzun.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a46769c3437---zudema.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/loxufenifevinivapowiz.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ef221106c---ditet.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/rudabuka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=what+does+lamo+meanPDF 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_off0000f066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF066 10312 bytes
SHA-256: 3918e4b19a84eabc54aaa22297c2aa3c6873a337576fe697f7581e0d32d18976
font_01_sfnt_off0001077b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077B 18868 bytes
SHA-256: 33ac1574072ff403027392c6a55c89a499d395f2e3a866b8a66292a1314c920d

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