Malicious PDF — malware analysis report

Static analysis result for SHA-256 440674ac1710c67a…

MALICIOUS

PDF

90.4 KB Created: 2021-09-15 18:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 517fe0bf0a07ed7727b064a4d96b8be9 SHA-1: 1e941b8c22a3547f9993e25d0fd4abb7bba85c72 SHA-256: 440674ac1710c67ad7d735e466c6754f6a2b9a0d47a14f78bcd8d12ab6ec4f85
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains embedded JavaScript and functions as a link farm, pointing to compromised WordPress sites and other potentially malicious URLs. The primary attack pattern appears to be directing users to external, potentially harmful content, consistent with phishing or SEO manipulation tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

Heuristics 7

  • 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.
  • 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.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/6f2fd22e6da4d3459b45c74fcf856ac6/miruzulijogudik.pdf In PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/41259394556.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/20443081940.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f038106447---supusepi.pdfIn PDF document text
    • http://www.xzass.org/ckfinder/userfiles/files/dezamotixegab.pdfIn PDF document text
    • http://epicridesnepal.com/files/vunajogazi.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/9081965062.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/56961913486.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/73332536360.pdfIn PDF document text
    • https://kaparatt.com/images/File/36642664721.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/83384575762.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/8725947727.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/lokaf.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb430db8b0---17383442860.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/bixoxato.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/xuzeg.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/28041979254.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/23325261715.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/71972772220.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/jujonupisuvukuxopuxaza.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/64634150813.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/09c5fe822abf72bae742718385f735cc/buvegexisusojugejexobib.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109031146368531.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/3243918893.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/buzefonirifosineseza.pdfIn PDF document text
    • http://cross-winds.in/upload/contents/images/images/xafemibimo.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/vikifomivebunidem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=cara+membuat+aplikasi+di+iosPDF 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_off0000fb50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11367 10812 bytes
SHA-256: 1fdd4569904374b223e4275d38a0c1a8067c456b6fda259190885525bfdc5680
font_02_sfnt_off00012c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1F 17792 bytes
SHA-256: 02469e5da645414775fdb244e04e1fed26157d611af91acf09c15cc9a1cc4df3