Malicious PDF — malware analysis report

Static analysis result for SHA-256 958690208900ea39…

MALICIOUS

PDF

84.5 KB Created: 2021-07-18 11:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 12a009c5011bff38643b2b530922c902 SHA-1: aec0abc3888b9b42feafef35ef75b18f7c7977f8 SHA-256: 958690208900ea39ae2d6644945dded6281ee9e1aa1cac0bdb656fde89b993ed
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of a link farm on disposable hosting and compromised CMS uploads suggests an attempt to obscure the final destination and leverage vulnerable infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607962100d120---vemilufugituf.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1609763ac3ab51---63569097460.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/e8026209de2c04e29f8d690998896867/makulesijivifiji.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609e028096aaf---sariw.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a178da2f000---guxanetevufojo.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608291d56f1cc---20991204533.pdf
    • http://614move.com/clients/4890/File/bezipodixugevopuwede.pdf
    • http://debden.org/userfiles/file/weligibolazatez.pdf
    • http://hurtglass.pl/upload/file/majubezu.pdf
    • https://bruceautoservice.com/files/file/66123756685.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160812a75882af---85414894306.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/2a1db9a8bf5b8eb4a6b15ce3e25cb76c/64698071984.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/14e6081791096b3fc199629a8eecbf2b/63213903588.pdf
    • http://wskinbody.com/data/boardData/files/tadazekifefekagakaf.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bffb81b574c---16752917269.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d27c238c8---64325771061.pdf
    • http://fly.no1-yes.com/userfiles/file/duxiwonipomajimeteguder.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/17cl7jn2p23rbcksr8h8vphfiu/mepimalegosorox.pdf
    • http://zlato-stribro-investice.com/upload/files/negad.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/1e2ba346b6662c11865261d1dea5a235/polidosubuvozu.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087d8502600f---5889052496.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/j7nq1b1t30mefbd28uqkbqh0i6/sefil.pdf
    • http://crmrealty360degree.in/userfiles/file/2754704872.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608058b70437a---96553449349.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=what+helps+settle+a+stomach
    • 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_off0000eb61.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB61 16792 bytes
font_01_sfnt_off00010378.bin
1803c15128bd9cc2482ee9abec505861a875a6af8d6235370877e3d3b0bbd631		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10378 10336 bytes
font_02_sfnt_off00011add.bin
0e5537ef1d0610e4e301caf223f338c16f6d5b9ff49c8a5ee006575c2f7800f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADD 16368 bytes

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