Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f5b6a01259b7471…

MALICIOUS

PDF

89.1 KB Created: 2021-08-13 08:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: d61a8f85c22c4bce59a8070774b93a5d SHA-1: 26c94d5a237d1c22db757c08f60a20b700925378 SHA-256: 3f5b6a01259b74711dcc31b4d966e8568417f84c4d26934c4261b590b44be0bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm used for hosting malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

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://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16104d748f3dd5---13365955630.pdf In PDF document text
    • http://veterina-hrib.cz/user-uploads/files/tojofapodirikelisa.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080acaa3d51b---65182197405.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d81cb1f61d---70355237521.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/i9um5uts48tsu72c5e76g276m5/54171873549.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/4f38bfc813ce60cd40b5858514227689/vubavoke.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/7a70cco3e3nau9b9u34brj8753/gukesiraxopepo.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/244464a70b9650f35810f7fc3980739c/87476630362.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/zozusiwiv.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/6i78eao0hcjq0d01guod08pnci/wimidakivodopu.pdfIn PDF document text
    • http://peusch.lu/userfiles/files/73350981980.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adaee2ba9d8---83914512163.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/oqhjca7arji376ita80bclfmj8/53786064970.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b89b58fb7---sotijabowida.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/96607224149.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/mawaguwodaxobo.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/72c47bef5ef26d8645aaa3892469c6bc/dewadebobivubasekijuku.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160e8c8d1d4b7e---37482459206.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/8607e9488b08c8c3630fc4a4dbc5e7c7/fubotikime.pdfIn PDF document text
    • https://xn--faade-zra.ch/ckfinder/userfiles/files/88660130237.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070509fc2559---nuziruneleturomijurodakir.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/bc44691e0779712395f4b40c48db5644/voxutujixekofo.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/kegug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=present+simple+present+continuous+past+simple+past+continuous+present+perfect+future+exercises+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF689 10984 bytes
SHA-256: 8c7e0c6cc74e8873e0cafdfe859d942e5a857eda20ca32306d1fea628ffb1af3
font_01_sfnt_off00011015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11015 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12827 17084 bytes
SHA-256: d0af41e6f7c1d21710b1c373f2cfff6ac95504b85a33b2980a840dfd640407f8