Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f4ba40b1ed93b3e…

MALICIOUS

PDF

97.6 KB Created: 2021-08-10 22:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 764d69327e7905339de11decf9eff59c SHA-1: e629ff036aa52819fc5ed8097e5182953e11e49d SHA-256: 3f4ba40b1ed93b3e936d70294501845b66fb0c53b7fa39e3cb23e3e29612b383
156 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. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • 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.
  • 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://licorne-hotel-restaurant.com/userfiles/file/bodijisupaloba.pdf In PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6fde59274---wuvimeji.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d5075b7361a---gizarowetine.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/tesos.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021061914512048.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/pesakaderumawipe.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/ed63438db4aaac7d3e6b608a89edb9e8/82963575388.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/silitelelufaledigutopudo.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/77772700008.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4da322836---pafasefo.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/bb2d1b80f3fbfd98a148cda832b50852/95316144666.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/57863875518.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/9097318836.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c3e9aac1d---kemapawesamuxebaduwani.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/5288cb9b42d2fe44a64b78bae9c12251/pewoxixevolitiro.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/22918162585.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16073777e2f38b---pijitemotawuto.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/82321c47ae571293601b4b893f7b5c8e/64037789736.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/30289502470.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/20701863630.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/se1mn5vtn0dv7enhi10lo9n8od/jagojikazixapinovexokuwad.pdfIn PDF document text
    • http://charlotteellisscholarship.com/clients/a/a5/a56794a54ce3a7e2a8fdc514f00cf952/File/lexefunadowagupetupixi.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/nunirubudekaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=your+first+year+in+network+marketing+book+in+hindi+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_off000117b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC2 17300 bytes
SHA-256: fbb51081c6961a0bba8e2345823556a136895faf9c770b3140fb3d2aa131f180
font_02_sfnt_off00015d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D14 11416 bytes
SHA-256: 475491c1147688ffabd9cc592545085c7b05172b70928c55ca07d9e37e3adbbe