Malicious PDF — malware analysis report

Static analysis result for SHA-256 7432af0546d08c17…

MALICIOUS

PDF

82.8 KB Created: 2021-06-25 14:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e249ba4aa050697ce88716c74faeb72 SHA-1: e5e0305191cbf34aac73848d0a5e535c3385ffb8 SHA-256: 7432af0546d08c176c5de3ef40b77b5b8e1ac1cd9b29bde960c2a79efbf6b28b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to compromised CMS upload directories, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest malicious content. The presence of multiple links on disposable hosting and the use of UTM parameters further support a phishing or malware distribution scheme.

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://tingyi-bnb.com/CKEdit/upload/files/jibap.pdf
    • http://aarogyamedico.com/userfiles/file/libaluvuxulobulufopefukes.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/k3sa8dl4pnb4va29lf60jc076r/43224346309.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608147f237e7f---22848283789.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160a0aafe7a016---40006235411.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/eeskidmdu4jenjsm54vbu2kndm/11311097729.pdf
    • https://curewelldiabetes.com/userfiles/file/morukunepatuna.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c407d5ee89c---95939863598.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c87fb6420---livarusose.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a244e01882c---26740895411.pdf
    • http://bkdesign.ee/userfiles/file/66560339132.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609948503be0a---gesos.pdf
    • http://blbr365.com/userfiles/file/1624544604.pdf
    • http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/13664838103.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c15c3b1ecf4---38924400684.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=flaking+roller+mill
    • 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_off0000e0de.bin
3295af617e73cde6523520ec50c8d8be99e84258bfe8b83f2b46405b19e81179		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DE 10252 bytes
font_01_sfnt_off0000f7c9.bin
23084c08bc1a76e14ff1bec949e5247c890ea7d1ee177b9812c2115f1a48b84d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C9 18540 bytes
font_02_sfnt_off00012689.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12689 16792 bytes

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