Malicious PDF — malware analysis report

Static analysis result for SHA-256 756aae9a3293c6d0…

MALICIOUS

PDF

85.3 KB Created: 2021-06-25 14:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e3e569b7f586bde8b2d468e6757dad1e SHA-1: e2f65b2c422ccf7cda8c459f997ccfc9b2f764c8 SHA-256: 756aae9a3293c6d09f39b76baa16f391bbadbc3dc22014f491cdadbf5aa30a64
156 Risk Score

Malware Insights

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

The PDF file contains a link farm hosted on multiple compromised WordPress sites, with many links pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links on compromised CMS upload directories suggests an attempt to obscure the true destination and leverage legitimate-looking infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c6fbf48d9eb---71404655543.pdf
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/ac799bdc0418da8a1d99aad11860e5d2/wikan.pdf
    • http://www.findvoters.com/userfiles/file/32600886630.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d3566294e---9742265824.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/79d38275c1a03b2ba5db3114c981b6dd/7964649000.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/2cs1l46sabu2q7an373g6g15b7/55187847598.pdf
    • http://jorkurojus.com/userfiles/file/daxeno.pdf
    • http://assistance.uz/images/shared/file/23441089949.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085585aea265---80891240903.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160958b41d5d53---natude.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608f996e8d804---6671051761.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607404b25f59a---lupukivasebuzip.pdf
    • https://securitydm.rs/slicice/file/65912440170.pdf
    • http://artospace.com/pics/file/15199399321.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078fb6e148b7---5140614415.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=scary+movie+6+cast
    • 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_off0000eb9b.bin
58e9ec268cc33ff9e074312db4157cb675efe6f190944fe187c9805eec8f9d26		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9B 10664 bytes
font_01_sfnt_off00010427.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10427 16792 bytes
font_02_sfnt_off00011c39.bin
a8e430e2ccd75d0eb10444a9c5394da8253ec89df5c137cfa080ae6375ecc8d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C39 17092 bytes

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