Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e599a0f529bcc4f…

MALICIOUS

PDF

86.3 KB Created: 2021-06-26 14:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b758cb321adcc8872625e867a13710f SHA-1: 528d42ccfb0aa57116b822d283a75f7ad79d4cba SHA-256: 2e599a0f529bcc4f2a7138e7faddfe514ac819de8697a9050ef877a9a69b9834
96 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which point to websites that appear to be compromised or disposable hosting. The ML classifier strongly indicated maliciousness, and the structure suggests a link farm designed to distribute traffic or host malicious content. No scripts were extracted, but the overall pattern is indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://coretry.ru/uplcv?utm_term=spongebob+squarepants+employee+of+the+month+video+game
    • http://fitviewer.biz/files/file/53599454145.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ca0b93d33---48588801209.pdf
    • https://chokysitohang.com/Uploads/userfiles/files/xefimuwesux.pdf
    • http://parkhighclassof60.com/clients/871169/File/85926321336.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607097ea67d53---55830822892.pdf
    • http://www.celso.org/download/zelupetexuvijovazemareme.pdf
    • https://laser123.com/geektic/files/duvudasojofulebe.pdf
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076136a70d6c---87409218823.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/daukntblrguaigcnlihabm9nc3/kuvufaregok.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160798725240c9---vuzunowosinimadebo.pdf
    • http://dh-cell.com/ckfinder/userfiles/files/fipudovoluxe.pdf
    • https://kopari.hu/files/file/topawalovokosekivawoxiz.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0aef60eaa3---35621727733.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812dcfc79d4---giruv.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/473cda8c323f97c75b4d19ce8296cde9/47062333298.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086505a60aef---refetazonexisalepoxonoxo.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1a4100f62---legab.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ea57b5ba0---40321701610.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdcadbe2dd---libupipimediruj.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16081aa179b998---80913127159.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081bf3e29048---73981215816.pdf
    • https://auto-rujo.com/images-editor/file/68902245396.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2f6754174---82357833498.pdf
    • 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_off0000eb86.bin
16321e143a9f2ff93f5f48e9524a289f8d85233e75f0764853af2d0105738338
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB86 11584 bytes
font_01_sfnt_off00010627.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10627 16792 bytes
font_02_sfnt_off00011e39.bin
4920d0e86534ddb12eac619536e8c38412773078d5093b80698f36c87085b328
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E39 17364 bytes