Malicious PDF — malware analysis report

Static analysis result for SHA-256 792c5590485ae388…

MALICIOUS

PDF

72.0 KB Created: 2021-09-18 20:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d3f083b1e7e8cf894cd0b81768d8adbd SHA-1: a8dfd3224b9884c11c7342b40879e5252d9d3982 SHA-256: 792c5590485ae3889e55e038d86115e809cf04334dceb94a35b3827067313a0b
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as a malicious PDF by ClamAV, specifically as a phishing trojan. Static analysis reveals it functions as a link farm, with numerous embedded URLs pointing to various websites, many of which appear to be hosted on compromised CMS uploads or disposable domains. The presence of a 'utm_term_redirector=True' heuristic further suggests a redirection mechanism, likely to lead users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4326

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 https://tsydesign.com/userfiles/jws/files/49243089978.pdf
    • https://motoralbini.it/files/file/wulivebula.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aab534c9cb---rexeguzesedegixovitun.pdf
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/81059797450.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/ojjed78d46ivs90mafbd96v6o2/sevot.pdf
    • http://www.motionmantra.com/userfiles/files/giwivakixinexuxifuzel.pdf
    • https://global-product.org/CKEdit/upload/files/felijipo.pdf
    • https://shieldtech.cz/ckfinder/userfiles/files/dilavonela.pdf
    • http://wellogo.in/userfiles/file///86747519507.pdf
    • http://moutierrozeille.fr/userfiles/file/vowaruzubofebegijemibo.pdf
    • http://coomargroup.com/ckfinder/userfiles/files/munijivoxokesuluri.pdf
    • http://thibangoto.com/app/webroot/uploads/files/35778753596.pdf
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97524225204.pdf
    • http://rjbmachinery.com/d/files/sijume.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb5440df54---78026617600.pdf
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/wezedowarusa.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/feccd616fb0400adabee1ca0711fb274/wesozom.pdf
    • http://alcantara.cz/data/file/rixijujegofuxokotepar.pdf
    • http://xaydunglenguyen.vn/upload/files/0853ec.pdf
    • http://technimexvn.com/images/ckeditor/files/wiwejikexuk.pdf
    • http://arcstema.com/userfiles/files/kibesapezuvunatenenapit.pdf
    • https://markmont.eu/editor_uploads/system/files/siwigumagojuk.pdf
    • https://serviceelectric.ca/userfiles/file/5130328563.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=virtual+family+2+apk+mod
    • 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_off0000d75a.bin
faf484e93becf8b67d82c8e2e9918675dcc4a45902c523c6ae4cd28b5e608bdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD75A 17728 bytes
font_01_sfnt_off000104c9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104C9 16792 bytes

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