Malicious PDF — malware analysis report

Static analysis result for SHA-256 40f2719e7063ab58…

MALICIOUS

PDF

73.2 KB Created: 2021-09-17 12:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6484cc6a5d009055627cb2ab8294d654 SHA-1: 61fab8b628c94e1bf8c22ab3c1e17feffe2658a7 SHA-256: 40f2719e7063ab5818b5d75795e3008a20f576337182b4064aa170dc9c1ee4d9
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, suggesting it's designed to redirect users to potentially harmful content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

Heuristics 6

  • 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.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/23526278789.pdf In PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/gafetekixokerusuleruge.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613480a7944b7---76552533162.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/83489546382.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/b49ea431946105345e6bd6aa886f54c3/55990423490.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/37731872207.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/wuxorajavakekuwefazebasib.pdfIn PDF document text
    • https://receptabc.hu/images_banner/files/9596530256.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/mamosiduwidag.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/nopigirepafatuwo.pdfIn PDF document text
    • http://tjtvina.com/Upload/files/62842277875.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210907055610.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/wuwanejuruxareg.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/zelowekiwuwes.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161392b98ae53c---97563544798.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/85012420742.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/b0ed547745bf74172b4e91d4961827f2/75863495615.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/larutedusejifuf.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/fabinerited.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/tudufisomezikelekelato.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/fapakoxuvef.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/zewexovuduxokakugawaz.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/95692832546.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/88932802869.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/94183152417.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/97214722155.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=mall+tycoon+codesPDF 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_off0000bc80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC80 10276 bytes
SHA-256: 2a18bf4442bc12bd8102fad52e6a6e1ce919cf7c6278644c05db39d817549378
font_01_sfnt_off0000d3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D6 16788 bytes
SHA-256: 9a64c9d81d8a7d8db69f894bfb2b5b32cd9537a35507ab42d87f4a393a919745
font_02_sfnt_off0000ff17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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