Malicious PDF — malware analysis report

Static analysis result for SHA-256 c43adfbd9321cef4…

MALICIOUS

PDF

70.6 KB Created: 2021-09-24 07:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 30c550981c0017b8d2e3931640e7a5e6 SHA-1: 9a21794921e309c013c4437952d42d815861ad9a SHA-256: c43adfbd9321cef4e19c748cf131460e54a6d4ca574a7fff26e9ed3dd09b8217
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links to external websites, many hosted on compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users through deceptive links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5522

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 http://ptaki.info/imgekoprojekty/files/67653789140.pdf
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/diforulurisazamukiw.pdf
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/12634565436.pdf
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/sajoguwus.pdf
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/rekakogine.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424eb914b5f---sijovawutoje.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bab23745c6---kugesibufaxaradevineli.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df649120d5---wujaw.pdf
    • http://aokunoil.com/ckfinder/userfiles/files/13979883463.pdf
    • https://riosemarescentrodemergulho.com/ckfinder/files/46807751831.pdf
    • http://feuerwehr-mittenwalde.de/mediathek/files/dagepoleverevaz.pdf
    • http://vanharteyoga.nl/uploads/files/70208589696.pdf
    • http://dasbluemchen.com/fazoxozoveranadulusofe.pdf
    • http://canadianrockies.info/files/file/48172003650.pdf
    • http://autosoftware.company/autoresponders_images/files/zogubu.pdf
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/16430222681.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d2fba3ebdc---51448212682.pdf
    • https://thegioibaobicarton.com/Images_upload/files/milosiletixen.pdf
    • http://vocal.bpv.su/content/files/files/gidaxilibinebagekabaguxus.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e3ff94b69---gominitunoxelolonuv.pdf
    • http://ahcxdq.com/uploads/file/080837565322.pdf
    • http://slxiang.com/v15/Upload/file/2021912191326169.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=cellphone+anime+wallpaper
    • 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_off0000dbd4.bin
f9b92cbddb4fc732790047acd719d82d5743f1754c3bc8d52e3365ba379ff2c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD4 10368 bytes
font_01_sfnt_off0000f30c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF30C 16792 bytes

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