Malicious PDF — malware analysis report

Static analysis result for SHA-256 20e2f68fb7e39b36…

MALICIOUS

PDF

95.8 KB Created: 2021-09-08 09:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 76baa9a3eaa87548958ea1973b36606e SHA-1: d00e1408fc3d90918ab90e4a6b1b326617a1aaa1 SHA-256: 20e2f68fb7e39b3679c80fe84b2e6077dc28448d864ce75be124cd09af35ba02
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to lure users to external sites, potentially for further exploitation or malware delivery. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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 http://slmj8.com/data/userfiles/files/41258226327.pdf In PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/21158556199.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/31605270355.pdfIn PDF document text
    • https://actorconseil.com/files/file/lekarale.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cad8094c1e---junowuniworipoludatoru.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160736ff2133b6---zipirovadasoxoxiro.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/80455195409.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/49838071200.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebee1e3a79---35457817806.pdfIn PDF document text
    • http://zoop-tech.com/ckfinder/userfiles/files/60898579868.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdbfd9a231b---segapuvedefosejijimodav.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/pinazerukowenirujugex.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad194fd0bc1---jidulexebafigolagadivek.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/13270164575.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/r9o02m54u39q0vf1itvgu702pp/panimovijiwuwobuze.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac591fbb308---94244569261.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/36bd3805723e75ea231be77acf8ec59e/91642324726.pdfIn PDF document text
    • http://ladulceseguros.ar/noticias/fckeditor/file/wazufedotezew.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/fetufumikadenijalowago.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/0ip68r2e3vjphm7iskqa43inin/45202888493.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160842694d3ada---40359393900.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/28023260677.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/gulid.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/nazaxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=visa+waiver+form+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_off000110b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B7 10532 bytes
SHA-256: c313a5d7b4de926c7e9432d1d63fadef90c32b597173c130ce6f1c255a1b6988
font_01_sfnt_off000128c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C6 18704 bytes
SHA-256: bf6b2a529094c757133e4844319fe1bb5bafc42b19aaedfad45d50a766d95596
font_02_sfnt_off000159b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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