Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad55541e84375624…

MALICIOUS

PDF

81.7 KB Created: 2021-09-04 20:24:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 52caa467981bd0586c1925249055e78f SHA-1: e3b84a86e69b72e6bd0ab87b336593ece2f3ad03 SHA-256: ad55541e843756249af3b75d286af980c3c126df2455f466b4065a8a0d2f88d2
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to potentially compromised websites, likely intended to lure users into downloading further malware or submitting sensitive information. The presence of multiple links hosted on compromised CMS upload directories reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/7240451b4b587f241aaa4a957a75086b/32062855342.pdf
    • http://dragonspond.com/uploads/files/riwazijerokozujosonopobab.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160ae32b2ef74e---31851916416.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/ehio14mfg2cjt81rgtlrm9bk13/24200957869.pdf
    • http://lso-msm.fr/userfiles/file/36741452515.pdf
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/76981420708.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c91f91f232913953a36a5166ee5ce0a4/86692131271.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2d46d8644.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/8bac992ce763e90971fbef992b4d9e51/kumek.pdf
    • http://amesonsofallen.org/clients/53156/File/munudakodirafuwuvekoveg.pdf
    • http://ke-sen.com/userfiles/file/1628065395.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/pls475t800pog5jnifofutvrj7/39851041703.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/c120a9086fba05ab2272920698e01b0d/18921834352.pdf
    • http://jingkangchem.com/upload/files/wojikixox.pdf
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/53404899138.pdf
    • https://vidaleve.net/ckfinder/userfiles/files/46875561550.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16080211b96f09---46819447924.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cf2e2b44d6f---puleladugi.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0de8875b21---18169621311.pdf
    • http://mt-filtration.com/uploaded/file/982520686112822211b98.pdf
    • http://dade666.com/userfiles/202109file/2021090300260270554.pdf
    • http://khangvietdn.com/uploads/file/vubatakawadewuwapome.pdf
    • http://www.moyekolodin.com/files/ponosus.pdf
    • http://synthecinter.com/userfiles/files/83987205912.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=homelite+d3350b+chainsaw+manual
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db45.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB45 16792 bytes
font_01_sfnt_off0000f35c.bin
0ba92607d19c9466764533660c515a0c1ae1e9ccef1d9bbfe2ee4a720150868c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF35C 11280 bytes
font_02_sfnt_off00010da6.bin
885afaf18623e16bdbcc75800a7ebc44a1fcf781b594c7643a2edef69e016eb1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA6 16924 bytes