Malicious PDF — malware analysis report

Static analysis result for SHA-256 673f1599752dd325…

MALICIOUS

PDF

86.8 KB Created: 2021-06-28 04:04:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fb62a75761970d56b1240927db98b631 SHA-1: e8deb6564a73a53055cd8042ec8d0153bb239989 SHA-256: 673f1599752dd3254f32467ca3f06bc76dc15045dec723570de5e80a317c38eb
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://allytemp.ru/uplcv?utm_term=on+a+horizontal+plane+there+is+a+vertical
    • http://sattamatkapatti.com/userfiles/file/4481218725.pdf
    • https://amatnieks.lv/pictures/image/xanulemutisiweket.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094e950ea989---soguxavixojinuberexeb.pdf
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/donazupilepeki.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8be4378302---vivebemujukegedigorosadon.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d85fc44937---zagawagejofela.pdf
    • https://bajrahrs.com/userfiles/file/jovulevorudobumema.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c5af40ebad8---gejamufifutaxopaseje.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/lohme8di05dm36cro88o0l1fl0/vufudoduniv.pdf
    • https://hanahana.vn/media/ftp/file/64004592406.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160909af7647a5---kimof.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e70877541---togamibu.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba734635d---votesatitelezad.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160caf86a02595---78723000158.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160a6054425f2a---jitonomedalupupekakuriju.pdf
    • http://allycatering.com/userfiles/55047729064.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2f4f66fda---jerivizorutilovijokebaxi.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd6ca55cdc---mepufikilem.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/e6589fko0mqvhsvban4v2c49jf/65204440629.pdf
    • https://dollarplus98.com/images/upload/files/23484069122.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4ee05929c---tosolusedewugosaroboxudog.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb300565924---limiboziwo.pdf
    • https://kovosluzba-praha.cz/res/file/22232794136.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16071634c36899---golimufu.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_off0000ef38.bin
a3a16af14ee417cbadcb0833c2ad5da119f0e6f74a8a3490cc88bf4e33b4ad3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF38 17556 bytes
font_01_sfnt_off00011d85.bin
4c958b8efef4d8cc2f0c743c1efd88fbdbb91ad563708c0e5cf3d9e99ad81fc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D85 10620 bytes
font_02_sfnt_off000135db.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135DB 16792 bytes

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