Malicious PDF — malware analysis report

Static analysis result for SHA-256 686cc1d16dcf6fa5…

MALICIOUS

PDF

80.4 KB Created: 2021-09-18 00:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 26704ecbc071f781ce28acc9f94fa8bd SHA-1: 0c4ebc5657b327001c239952f6326a5bde4b1311 SHA-256: 686cc1d16dcf6fa57e9a2464896e43f354b4d2be6849f932db98f82fbce7f6df
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to compromised WordPress upload directories. These links are presented as a link farm, likely intended to trick users into downloading a secondary payload. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3499

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://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2a8c2cb61---kijelemovinizeveroje.pdf
    • https://korvioinfotech.com/ckfinder/userfiles/files/berodolilokitabemi.pdf
    • https://savitravel.ro/ckfinder/userfiles/files/69941076090.pdf
    • http://sweet-sugar.de/images/uploadedimages/file/lisiwibu.pdf
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/nojuna.pdf
    • http://arsvet.ru/img/upload/49711778674.pdf
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/27160178059.pdf
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/voxazepezilefawidotedali.pdf
    • http://systemsbiology.at/uploads/assets/file/vuxixalipimefetujorasowop.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0cc41cd0c---joxojewu.pdf
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/27331259695.pdf
    • http://smepil.com/ckeditor/userfiles/files/fesisazoxufer.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161338c5bde4d9---bavurekokafatal.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e7282e2f2---woxavewevi.pdf
    • http://nppmaudaha.in/ckfinder/userfiles/files/madek.pdf
    • http://futureinfashion.com/ckfinder/userfiles/files/46909121537.pdf
    • http://silver.jo/ckfinder/blanc/files/90679152824.pdf
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kebufunemomajapupoxafon.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133db9190ae9---90601716776.pdf
    • http://bellina.pl/userfiles/file/narefirogopul.pdf
    • https://noble-program.site/js/ckfinder/userfiles/files/sozemedesomosapopepudon.pdf
    • http://xingyeknitting.com/userfiles/files/jofujovil.pdf
    • https://limsurdua.com/contents/files/pofamoselinutulanu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=download+ppsspp+free
    • 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_off0000f071.bin
086643cba9748c59519171767bcc3506ada8b55a5c6cbb3b49575cbecb33940f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF071 10388 bytes
font_01_sfnt_off00010822.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10822 16792 bytes

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