Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d344786d3342e1e…

MALICIOUS

PDF

89.5 KB Created: 2021-07-14 09:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3bdba1584ed155ba62fba0fef4ee8100 SHA-1: 1f5a434e38c39028a2569251f9d35a79028983bd SHA-256: 6d344786d3342e1e753c4333cc39441dc639216e9c3ed33805875df1a4900b88
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, further supporting a malicious purpose.

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 https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf423ea20f0---nejuzeruvategokix.pdf
    • http://agcslohian.com/userfiles/file/70140305125.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfc098d743---nerafalunevogid.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160969535e4a4b---2013826573.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8aae1ec64c---87254542561.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160afdb95f376a---gasarubipuwugomoborotagik.pdf
    • http://bitite.lv/media/txt/122/file/62091522264.pdf
    • http://szwygs.com/upload/75050643248.pdf
    • https://aedwea.com/upload/foto/duvokal.pdf
    • https://perfecthospital.org/FCKeditor/file/sujuloliwesox.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16088535341487---78229792819.pdf
    • http://mopi.eu/ckfinder/userfiles/files/66702872424.pdf
    • http://doktor-okonski.pl/uploadimg/file/wekujuzubopazod.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/a915b0fa2a894f586f9d7f4411ec01bb/62045132660.pdf
    • http://bkbflooringusa.com/userfile/abbey/file/lebogejuza.pdf
    • https://nasroglobal.com/userfiles/file/gegodakuvanifefaxerara.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/j8qta208mp4gqvumd87o99gv37/zunaketijivekerafak.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=formula+based+representation+in+data+structure
    • 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_off0000f87a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF87A 16792 bytes
font_01_sfnt_off0001108c.bin
897bd0aa364469d1cf632a18057ff870df3564674200cbea9c96ce8a83e4eb7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1108C 17472 bytes
font_02_sfnt_off00013e41.bin
0a8666b81839b4eee607772c8f20443e5a085411b6d1796e08019c222fb864b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E41 10892 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.