Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aa24f8c4a320d10…

MALICIOUS

PDF

62.5 KB Created: 2021-05-15 06:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d5d0d66b2c3398f03a06ebaac78dd83 SHA-1: 8268a1ee55c832cbb5016e371183654d1bb613af SHA-256: 4aa24f8c4a320d1080556eb0ee943b3b496f214aa2082de524ed42665be85009
154 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm used to distribute malicious content. The document body, though heavily obfuscated, appears to be a lure for downloading a "Beatles greatest hits zip" file, which is likely a decoy for the actual malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7689

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/6c3b072e7b8e05903b981e75812fd0ca/94892106341.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/fd97a5c0a940fbe2f0c9660825bf24f2/rovexoxe.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608995cb1d60e---mijirixukobumafajizisema.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991e0d7527f---95944589629.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f097e07c0b---kowuvudiliretodutalojux.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/7i2tr0iqm6edkd7nb26nf7os97/jizezelalopemekowurimivo.pdf
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/ea3ef3f3f902d0ade942bf5fc43f7db7/dizimofiruwi.pdf
    • http://riskhedgetech.com/uploaded/file/1039929296609b761db0fb5.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/7004be90c1f75154a0f2fca84eb34f16/92494321562.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/2aac84ee7438008154f0f0edbb162422/pafokebemasuwu.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072ddf88592b---83059053062.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/dc10a0ec0e91379fec063d33ca91423d/fivamenukijefo.pdf
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/b0464bc141a046783fe6f441532daa36/71512703570.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=beatles+greatest+hits++zip
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da80.bin
ab42a8eb3951241c596e2adb07b3ff69c8c6f05ddb08a95be4733c7324c94332		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA80 5180 bytes

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