Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5d1b8837b51a83e…

MALICIOUS

PDF

67.9 KB Created: 2021-09-04 04:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6b9a16561338cc1557683e4dc8714da1 SHA-1: 46d53fb82aa0932e10ada5c53f5537b7c6615d28 SHA-256: b5d1b8837b51a83e49918364c032efca826381b4b420d9980704514e695fdd09
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple domains, many of which host PDF files within compromised CMS upload directories. The presence of these links suggests an attempt to distribute malicious content or redirect users to phishing sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9158

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://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/64bf83c3f5d1f7966ee96ba8a60d8090/77560181814.pdf
    • http://karmand24.ir/basefile/ehotel724ir/files/relawod.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/epg8f5lptkdtr678padre9t5i2/lagogedoxoxorirutawiz.pdf
    • http://airlineclassof66reunion.com/clients/c/cb/cb51827d251551eca15067b3b23580a4/File/9401101193.pdf
    • http://rbtyutj01.com/userfiles/files/fonogujowozage.pdf
    • http://arunimaflavours.com/userfiles/file/nikisurasufotizobepoju.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8989ec2ccc---sefaporu.pdf
    • http://grafosaleservice.cz/images/fck_editor/file/munumezemikoleseve.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160790a8222a4f---99467807259.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f869d4d4b4---23702070888.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/jfh4v2nk2hj9p47dl49u773sms/doduzuvufedos.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/e3679acbb6b300f557c04c057ef1325f/tuvefom.pdf
    • https://kaimano.it/file/91495834176.pdf
    • http://nurugelexport.com/ckfinder/userfiles/files/66976715156.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703585bb3c8---54115433551.pdf
    • http://csc-0898.com/userfiles/file/20210823224601_yx0og6.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7adb7edeeb---30658031514.pdf
    • https://mimpiindah2.com/contents//files/75808181933.pdf
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/76840654931.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/c961f9287dc59938faf92cead842ae1a/36761244786.pdf
    • http://riggi.ru/userfiles/file/numalixusoxupajufifibu.pdf
    • https://denizlihorozu.com/resimler/files/92748157958.pdf
    • http://clarksville.net/wysiwygfiles/file/47519957568.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=bs+grewal+book+solution+pdf+download
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee79.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE79 16792 bytes

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