Malicious PDF — malware analysis report

Static analysis result for SHA-256 cee38654fae5cd9d…

MALICIOUS

PDF

91.1 KB Created: 2021-06-27 16:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dd59bf063625e5ee928204472b13c216 SHA-1: 12c03ab00c59d162e09909dc5b15452c7ac53599 SHA-256: cee38654fae5cd9ddfe53b9f35521acf9d980be4105c4ccadd55557a40c6cc48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs and links to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDFs designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://huntic.ru/uplcv?utm_term=which+bread+is+good+for+weight+gain
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160887c2b68fe5---35565584493.pdf
    • https://haltia.mx/sii/ckfinder/userfiles/files/6698924474.pdf
    • http://www.niziointerior.pl/upload/file/vetopadonatubokedigi.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3738ebd1b---witunemisodotobekibifedep.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/1m36hs1m4gg3teijq8v0avip3j/guvekatetavunesozijiz.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d15d7cfae7---24735599394.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/f1fa47358014ca95e931b9e34717b389/totirubotoligujifufuvil.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/92262669e9ff8597ff0efca1695b9e12/dobunane.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d51e4d92d8e---jirifazirekoreg.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ce365b2f4---fadakeroweluviwibuk.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b46810b3976---gogatovazunamisusa.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813ab9422b3---joxafezonekunewegulamif.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/55772490c635598964104a8a5d0856c7/98567729494.pdf
    • http://bestbuyfromindia.com/userfiles/file/65902878980.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160b14f7cc3ba4---21380235601.pdf
    • http://nesthomes.in/userfiles/file/65986491706.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160836d69c32fe---94881323896.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/j6v89klp68f4cflcesjn0f949e/solexijegoruwofule.pdf
    • http://www.truca-taoules.com//ckfinder/userfiles/files/lonobawaxigitunu.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ac511b40d---77377116703.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/ee06dd09cd0a843535f2b8046d432cfd/newabebuzukapagekumuve.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/c8413274fa1ecbd35d16137feab8135f/25513297698.pdf
    • http://architettotoma.it/userfiles/files/69275442563.pdf
    • http://agendaalzheimer.org/files/galeria/files/ramatefejifapevibo.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160c95fe9f386c---kametojozozujinenijeguge.pdf
    • 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_off0000fe63.bin
4195a08b0e08d74bcb03c7b0f2955d09c0161d13cef55dec042b10dda1c98018		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE63 17456 bytes
font_01_sfnt_off00012c0f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0F 16792 bytes
font_02_sfnt_off00014426.bin
cb382c77c9889cc945505c551a6a10696f2c648345edff90f77eb93ae961cbde		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14426 10928 bytes

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