Malicious PDF — malware analysis report

Static analysis result for SHA-256 9059f31267b994f1…

MALICIOUS

PDF

98.4 KB Created: 2021-07-13 21:17:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4a941354a09de21ee2cf4be6c5037ee3 SHA-1: e2cc43be5fbc61cc6fc8b2c3c9387f8be4e10c75 SHA-256: 9059f31267b994f101754e2179993f44c1c698cd83125513187e33688595eb53
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristics indicate a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute phishing content or malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d344873e1---lerixiwezomipiso.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/pu4tiigs0gso39qr5colpej80d/jagosebowezosawekabagexa.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fd1508094---77319298569.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160758cb49df9c---nexanud.pdf
    • http://nature-revive.org/files/file/fodukonalosurekabuk.pdf
    • http://muzycznescyzoryki.pl/userfiles/file/53163820255.pdf
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202107040714416603.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607db658f3a8c---tegipokuwetebafupo.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/3374747c62f4e38c845f136636ec8c11/zoduvakaselusonuke.pdf
    • http://panziofabian.hu/fck_kepek/73251369548.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/82pffa845aj5sgb7eptd21evk2/pomonifako.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/34kume69v4kh0jdenalmd29cf9/44763240128.pdf
    • https://moraure.net/js/ckfinder/userfiles/files/sijubojileguzibixovunupet.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607592b892ab2---zorikukavek.pdf
    • http://microcement.ua/userfiles/file/10257070419.pdf
    • http://marthomaiticherukole.com/userfiles/file/26730545015.pdf
    • https://greenfuturevietnam.com/Upload/files/kitonemenin.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160af5c4d7e7b8---15295701240.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b54ea7cf73---6462504519.pdf
    • http://3qbuy.com/CKEdit/upload/files/zurumil.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609da653d0de9---1001403124.pdf
    • http://architettosbaffo.com/userfiles/files/xubinisikaxagesemipixal.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c039c7443c4---banogaperunagusup.pdf
    • http://chicohigh1987.com/clients/47015/File/wowelili.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b440195bef9---67133066750.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=top+20+job+interview+questions+and+best+answers
    • 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_off00011e2e.bin
9c77f9e5ad2e3302f320bc1e14f19739f2e4adb25263c71748a662da3c6f4eba
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2E 16836 bytes
font_01_sfnt_off000149da.bin
068573b03143dd309b0d8680e5f32f793210fe68e7009e310615097f7a051c76
pdf-font-stream PDF embedded font (sfnt) at offset 0x149DA 11212 bytes
font_02_sfnt_off000163df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x163DF 16792 bytes