Malicious PDF — malware analysis report

Static analysis result for SHA-256 7976d577b3573a7f…

MALICIOUS

PDF

67.9 KB Created: 2021-09-06 11:18:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7984aeb88b1f73064f42b1e8007bad2a SHA-1: 2c6274ea9a67d863b010f3cb0443699a8176586a SHA-256: 7976d577b3573a7f8110725671b0974943549a0d84fd706261187f8657133e55
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress upload storage or disposable hosting, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to external sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9158

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://claphamtaxi.com/survey/userfiles/files/38899293999.pdf In PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ceead6c2a---10996962528.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/47522200054.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/55986499378.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210621221120_zx4373.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/volagerupis.pdfIn PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/tezojixefagafu.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5104d2426---55206693314.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/27125768498.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a05e0e817---juximibu.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/38948961446.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160881ebfd6fea---60649441065.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160acadc4e392f---dutedesamitolos.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16070b3fb9e113---kutat.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/lemudiberezudowupijawanij.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9f4e3eb57---95475375222.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/78026186542.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16074ca59ef1b2---kodederukokuzuxagazevun.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/979754c9f5d763e38b5f5a1df42f19ed/39239245739.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/xubajevixowiges.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/32177549077.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/a9a1e8e9c59542c6c9019f3a2e4e4a87/wodibijopem.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/bv0uubnkjmrre5th81f0i1s622/616356642.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=physical+education+book+pdf+class+11PDF 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_off0000d238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD238 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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