Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9494fbafb70b069…

MALICIOUS

PDF

87.8 KB Created: 2021-07-04 21:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d15a15b603460c7ff467e970c875be41 SHA-1: 85ea3ed550b2e74de8eabe314be5e8a253ca8b48 SHA-256: c9494fbafb70b0694db4c2796c75740245a2ec978c15325f6e9d21e60e1df436
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous URLs, with several hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://penzionklara.cz/userfiles/file/11960642647.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/cib7i9h8gkd21pa27rlb1i5317/zimuxaloduwowibizoni.pdf
    • http://aquamedia.cn/ckfinder/userfiles/files/surapuxaki.pdf
    • http://csc021.com/userfiles/file/20210620045154_raaszg.pdf
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f21d1090---logulawabozefogegiruvubaw.pdf
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/372794120.pdf
    • http://atut-biuro.com/uploaded/file/jifemibovesokugefobefoxod.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/17bea1874839c76a2f182164a758c0e1/91265703531.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/3iq6vd6ldovnvh2h6a8puevkpk/wetabo.pdf
    • http://accessiblevehicleservices.com/userfiles/file/lewizadevesulokegotebuxu.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/jjfcih9hf2ipf8temife6250c1/kakasulanojamosobugol.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2822dab4fb---12263196734.pdf
    • http://baigeleather.com/userfiles/file/21062380956.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd3c4730b---32155966240.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/0b70f108098dd439b65d0b3f6e888261/wosozuxuz.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/51cc116a5854c3d273069989e3c52441/regepupasifasugesuk.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ea0235622---36152807267.pdf
    • https://clifestyle.net/uploades/userfiles/file/xulemelovuxo.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/tue085nd82mv22ttgbpmepe9e2/33946667496.pdf
    • http://mega.kz/media/upload/files/pifidijazefizape.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609eaffd7f57e---mapabiveloniw.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/11b9ed6ed958f56a5fbd9f69ff9886c6/dutekizudavesefox.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/okv4dfcdfjru77l5d2jqg4amr9/37897695325.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=subunits+of+dna+and+rna
    • 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_off0000f2ef.bin
1c1f7ff1c724c247c4dbafce7b60463a731316cf271b8607f64eb70d0d04fe6f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EF 10484 bytes
font_01_sfnt_off00010adc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADC 16792 bytes
font_02_sfnt_off000122ee.bin
93144211b10da4b3a84a901d6d0c0fe53678326c9e84adf4a8f457ccb1600be2
pdf-font-stream PDF embedded font (sfnt) at offset 0x122EE 18048 bytes