Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca6662941baab629…

MALICIOUS

PDF

59.9 KB Created: 2021-09-08 03:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6f8a1e953436fc7e381222d66f1c2e27 SHA-1: 92d2dbada9206e00b5ee22ceaec1e099fef9607d SHA-256: ca6662941baab62972445bb5f6fdedb3b942a506233c776d27f7e291a4e7bfcc
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute further malicious content or conduct phishing. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7193

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.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc19ecbf406---63603873043.pdf In PDF document text
    • http://theheavent.com/userfiles/files/52861179764.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/tuxazudepuzezaboburewe.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/161261af4b8f27---35244942028.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/vejuzu.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606c984b50524---boselinezakuzufinavena.pdfIn PDF document text
    • http://lagunarent.lt/ckfinder/userfiles/files/3110582687.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/56021062816.pdfIn PDF document text
    • http://meskerjager.nl/media/files/81243028945.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/49382964085.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/37881432021.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/53555458376.pdfIn PDF document text
    • http://sharidyer.com/clients/863431/File/banebiliwopubero.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781e5823d76---46941047891.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/megaxuwegoluketejobipagu.pdfIn PDF document text
    • http://banquat.com/userfiles/files/nasipopafepumotunegoju.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/86086126847.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/95553123386.pdfIn PDF document text
    • http://adveotec.com/img/file/bigixoj.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/96925476043.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/51288237369.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa4386c44b---70257444194.pdfIn PDF document text
    • http://gyorszol.hu/userfiles/file/sisixinuwowazavubejobib.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/68115238635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=2010+nissan+murano+factory+service+manualPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD126 10976 bytes
SHA-256: 3b8ca201c7efad2dffb86968b924ea9553ff0e34b61fcce8c2bd8bcd3296002a

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