Malicious PDF — malware analysis report

Static analysis result for SHA-256 af50e62b73ea774f…

MALICIOUS

PDF

89.1 KB Created: 2021-07-05 23:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 470713b6b607775a19aa9b7d824be034 SHA-1: 87d3ef0a0e3739448692920b947129ef468ebd78 SHA-256: af50e62b73ea774f30ff8f0a69d90310655742ac73d8bbe8caa612ac6f13d6cc
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 designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://wastran.ru/uplcv?utm_term=certificate+of+live+birth+long+form
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160982afc187ff---90682255967.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c65c1e0f415---91587390367.pdf
    • https://tsegypt.com/file/rutovozosizobi.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/b1dfba5adbdcaf1219ad87cef1f40687/18665036454.pdf
    • http://atenngo.com/admin/sites/site/documents/88323827104.pdf
    • http://teenaramainc.org/clients/875997/File/94826264976.pdf
    • http://lasfyy.com/uploadfile/file/20210629161300847.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/895bcfc3209e9868975386e563fd35b1/75880979178.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/rvvefqvc7r2t2ch5i91tnkkvmh/1939170847.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f663630fe---82804138110.pdf
    • https://immobilgold.com/file/gerobezefobulopap.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/d0841eb178704a3181894483da868547/1829806522.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2594612f32---gezolukujekodoti.pdf
    • https://majubesar.info/contents//files/sefulejamematujuwe.pdf
    • https://fotobolfestmeny.hu/mvc/userfiles/file/26160473845.pdf
    • http://outspokenholland.com/userfiles/fckFile/20210617095040.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/bcb3893dde7c1341e469d3ea4e540046/xikadebamiwegeto.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/964f59a39c92c6b5e7b76d724c945377/xejudi.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b79d0e10f---gulabuz.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5dc587a6cb---81864271554.pdf
    • http://studiotecnicoarduini.eu/userfiles/files/95021809531.pdf
    • https://xo-sound.ru/userfiles/file/zonefimozasalewemadux.pdf
    • http://tamker.hu/userfiles/file/13252982051.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad6570e9b3---49819404483.pdf
    • http://peaceinsrilanka.lk/userfiles/file/80835544837.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b278364e3---fetafuxisasejetosod.pdf
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/s05mm9p465b1lbpnkno7l294jb/zewojebapozali.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_off0000f8c0.bin
83cb686934f7a31492f6665f5b47d6ad4faee32df16e3c4f4d4cec4f5b9a8038
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C0 10852 bytes
font_01_sfnt_off000111aa.bin
b411c3fc0115cc7309d2808db67dffbd3caebccadecd1ea2ef9599082def237b
pdf-font-stream PDF embedded font (sfnt) at offset 0x111AA 17148 bytes
font_02_sfnt_off00013ec0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC0 16792 bytes