Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6f651b29d77da78…

MALICIOUS

PDF

85.6 KB Created: 2021-08-30 13:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: f6d6fe84c06cf4841f75ea7e5bf4f5df SHA-1: ea5bf69368271f35a7b2e2773cd3f245ca596aa9 SHA-256: e6f651b29d77da78751168bbd42d47352addfa29234abc2cde2f4ab825f305d2
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c461e9384b9---24391408668.pdf In PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/0760039bfcce326057a7277d32173c0f/14637660679.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/4b751c603c77d2ce98f0be2e3fe78501/38826785026.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/18097588321.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d40e605d2fe---kegodi.pdfIn PDF document text
    • http://apogeeconsultancy.com/upload/files/16561486584.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/zurimigezejidalabulu.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/lujexokurufebilo.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/38784584434.pdfIn PDF document text
    • http://baominhlabors.com/upload/files/kilojawujobuzebekowa.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/kosemutagegopazi.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/31394899032.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/a6b1e818089144a474c674699dc106fb/gakujimomurijurotaduz.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160adfe880738d---4048094796.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b42c53582---nusazojixuteluxika.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/72848062038.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611e51dac376c---sepawekobaboximo.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16092ee18f0bf7---82976553438.pdfIn PDF document text
    • http://petrduchek.com/files/27613981301.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc0a6ea2ca---21835417463.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32c024da51---55725131142.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/cf3e2b6b6c720b0668410cabcbc45cc0/47716666867.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acaa7bce406---87906595500.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=marinated+mixed+vegetable+salad+recipePDF 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_off0000e5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFD 18532 bytes
SHA-256: d119edaff38037d3f79c2e4cd1301742ef985b3321f3a33786b7cc31a81450f8
font_02_sfnt_off00012e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1E 11036 bytes
SHA-256: 314f025dfc0984cbc089a03251b3660815d280ae02954a2bc199e742854e7e9d

Open this report in the interactive analyzer, or submit your own file for analysis.