Malicious PDF — malware analysis report

Static analysis result for SHA-256 343af51fcbd46e27…

MALICIOUS

PDF

62.3 KB Created: 2021-09-20 02:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a294fc8be27883c91e32a38fe4ee08c8 SHA-1: ca53837f8dadff2d40d482bafcca7bdb90a765c3 SHA-256: 343af51fcbd46e2746bee7e211857e502a59d747098f28ee6fd63f3c6497f12c
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to various external URLs, some hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious or phishing content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5156

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://garglob.ru/uplcv?utm_term=it+happened+one+night+full+movie+123movies
    • http://3colorjazz.com/fckeditor/userfiles/image/salivitaberutotepisalojid.pdf
    • http://bodemveenweiden.nl/bodem-veenweiden-img/19854964763.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/a6d4e353855480b2d68210bcd8771efb/pozodejesogoz.pdf
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/juwagawefefuxitonijato.pdf
    • http://billsky.ee/files/file/rilalimurebejag.pdf
    • http://ncfc.com.tr/ckfinder/userfiles/files/zegokujomaxomufobexav.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16147413e22770---furujavifixibeg.pdf
    • https://faresaldabbous.com/uploads/files/vonogapev.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/l9paeqvrgrktvt5q4nvp7uv0dv/97189175498.pdf
    • http://appinaris.net/ckfinder/userfiles/publics/files/xexevexipux.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/ithtrind4q7l95ioqnrivop12h/numij.pdf
    • http://pnalog.ru/images/file/vajidifo.pdf
    • http://lidaoxc.com/upload/files/rexalininalobimupovagi.pdf
    • http://sgd42.ru/userfiles/file/superipoviradelob.pdf
    • http://stark-tools.ru/images/uploaded/11127322914.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/dqcf1m0fpbuqbe4v7ai59p5dkb/barosodapitiluru.pdf
    • http://ct-tci.com/cttax/userfiles/files/fiwefi.pdf
    • http://tipkeo.com/js/ckfinder/userfiles/files/87776176193.pdf
    • http://gerastar.com/userfiles/file/suputijavotekavuwizijo.pdf
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/52637829146.pdf
    • https://truckforceone.com/upload/editor/file/sajonovipabogurejow.pdf
    • https://calmoinc.com/upload/editor/file/55958619980.pdf
    • http://1night2day.com/ckupload/files/vudifezekesofexib.pdf
    • https://igraonica.me/userfiles/file/sujumuxufadinanopug.pdf
    • http://laulumaja.fi/ckfinder/userfiles/files/xurofulesa.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4bf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4BF 16792 bytes
font_01_sfnt_off0000ccd1.bin
8a2d94d0dd2564399aa4cabe52d222e7feea79be7585e4eaef04bbf14cb9dee7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD1 14324 bytes

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