Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbe2a75c4e181c6c…

MALICIOUS

PDF

88.7 KB Created: 2021-07-30 22:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e400dcd3bd0186d231b2a915c5c3789 SHA-1: cfd983acd27a46ae947eb23aba1ed8ed24212b56 SHA-256: dbe2a75c4e181c6c73b6a4f6d333a9f3f18183fb00bac559f7ab495cc9ff1c3b
154 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8842

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://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160767e6519ad0---82414184570.pdf
    • https://atkarisuli.hu/userfiles/file/dujofuvofapunatoma.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160829e757ec25---52069252755.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f539b03cf0---nulogozazebulonor.pdf
    • https://promobryansk.ru/userfiles/files/nikeni.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/vrd2m72inl67lvlfbei089q8hv/69864873554.pdf
    • http://www.radio-kum.si/data/files/povunana.pdf
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jajavu.pdf
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/8195095632.pdf
    • https://umutisi.com/umut/upload/files/vodabosevopu.pdf
    • https://alsharqcc.com/userfiles/files/26659879829.pdf
    • http://aptchasers.com/FCKeditor/userfiles/file/lobusesitobogusutovaziza.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/fpjmvu02qmvdculsha8hosjo63/95486056270.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c179ead2563---fubuk.pdf
    • http://70sromans.com/clients/871711/File/vaken.pdf
    • http://arohitourandtravels.com/userfiles/file/winuralilapix.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160fd2fb024ace---12718729283.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609830177e7dc---92487296149.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/2r2q5ugrqem4p25gidlpo8uah9/79846815105.pdf
    • http://pahsclassof2005.com/clients/d/d6/d61c4c031b0f3af13d3e88110ef3a3e1/File/75548840736.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9136b3481---13010303932.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/635e3661adba59128e1531f86dcfd744/33836860685.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2e1fac94b---31317143362.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=proportion+word+problems+with+answers+pdf
    • 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_off00014b67.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14B67 16792 bytes

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