Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3c4df0c57351f24…

MALICIOUS

PDF

70.3 KB Created: 2021-09-06 07:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5607f4b04956fcdc4e8d9bf29d0ac98c SHA-1: 848ae1de01a916b6192052d28514bb4623a9b52b SHA-256: e3c4df0c57351f244d00f130589482ed380e840962ef1dc06d5fe45b82fcefc2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or malware distribution lure. It functions as a link farm, with numerous URLs pointing to external sites, some hosted on compromised CMS platforms or disposable domains. The presence of these links suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8805

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://crewmak.ru/uplcv?utm_term=laboratory+method+of+teaching+mathematics+pdf
    • http://salonorganica.ru/upload/files/sabiwijobevira.pdf
    • https://serwisnawigacji.pl/userfiles/file/94401391914.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1c42d6d2f---fibebifimebugitifasezixo.pdf
    • http://solyaris.pro/admin/ckfinder/userfiles/files/5972529238.pdf
    • http://treeoflifetolfu.com/clients/0/07/07f122ebb3396bb3f917f2e62af81596/File/3940150854.pdf
    • http://toshiteriyakiburien.com/uploads/files/4918658777.pdf
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/82831164617.pdf
    • http://mamnonlittlesun.com/upload/files/1367163059.pdf
    • http://mrpokedb.com/uploads/files/dalinafudivudefigidu.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844c589fb84---molaxejakujumopo.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/9fd40cc47d5b53bf012d6174506fe161/44798027928.pdf
    • http://pytextiles.com/userfiles/file/28642278945.pdf
    • http://appextskihjthj.handysociality.com/upload/files/8782552341.pdf
    • http://cichanski.com/Upload/file/10714368220.pdf
    • https://ayurvedaemart.com/uploads/file/87245891247.pdf
    • http://gwtcs.org/Content/uploads/files/lonozel.pdf
    • https://maconlux.lu/userfiles/files/devibemupijopokitusum.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af17f845e8---32394818804.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca66484fbb---devapinotikiz.pdf
    • http://writtenmail.com/upload_images/file/90141734088.pdf
    • http://asustainable.com/global/file/74008513561.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/46203b257f93b654cf16b4c727b260ce/26586858283.pdf
    • http://quiltingacademy.info/fckeditor/userfiles/file/39736796240.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160771c380127d---69549524191.pdf
    • https://foundryindia.org/userfiles/file/93821417717.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_off0000cfdb.bin
fa4bf8613fbccf125a5d61cf63363733e9f0da6bdfc240223b5a90a8b62ae269		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDB 18304 bytes
font_01_sfnt_off0000ffe1.bin
420add23b877709f744134c6dba063e558b92cdf04f8f709a59d223f86dcc289		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE1 11232 bytes

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