Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e32ad0821205445…

MALICIOUS

PDF

76.7 KB Created: 2021-09-03 05:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 44c61f9982356c9dc5345e9c2d39013d SHA-1: 271dd3d705ab60b8f92e639150d2f75f62a617ad SHA-256: 1e32ad08212054456d8b93dff8f4e3eac1705c949d99eb685b01cf305f85b8ce
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 compromised WordPress upload directories and other potentially malicious PDF files. The ML classifier strongly indicated maliciousness, and the heuristics identified a link farm on disposable hosting. This suggests the document is designed to lead users to malicious content hosted on various compromised or low-reputation sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://resonanceacteurs.nl/userfiles/file/37885611054.pdf In PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607faa99524af---lenaxo.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/aec2fc1385068c42e8d67ae92d3e0d07/89018261700.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/41025276687.pdfIn PDF document text
    • https://aneri12.cz/res/file/23816007547.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/6eba3e44c2c274da923319817fc2146f/tekeri.pdfIn PDF document text
    • http://ruresept.ru/files/file/tomovademizixoweke.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/b8318a0d0c27be1ae49d605722bc7747/fuwizefoverarawuvesigu.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/a4cc826dd9a564791dbab157e44d9950/69294696002.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cae48c12702---leposerewabi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816bc0c5685---17332183222.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/af401fb5a642ac66dbfb877b9f213042/vigajo.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b1dbb5034---44451282522.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/dalezewi.pdfIn PDF document text
    • http://doer-sh.com/Uploadfiles/files/14637787472.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/612d7bf48bd98.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/40279982882.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/9f62ed548da4bd300a4a813bb49ba853/25382641293.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/84376755130.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/1i2kgm8l5mq4bg2o5a71pkll72/54563709043.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/pabuj.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8e7ba1325---64536690480.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com//app/webroot/uploads/ckuploads/files/wezega.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/o7m3lo9m6bdaqggicoeffa2a27/41280137731.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=building+construction+book+by+mckay+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_off0000c5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E8 11328 bytes
SHA-256: 9b7b58c5af63fb415888f5162af773ab7d00d2b0ca22fd8e1d9b49319543b700
font_01_sfnt_off0000e02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02C 17116 bytes
SHA-256: 5518d674d352cc7d891911080b40d1a32e05f86c7834abadfcfc08575504e488
font_02_sfnt_off00010c6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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