Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab744584b725ddef…

MALICIOUS

PDF

84.2 KB Created: 2021-07-07 20:35:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 61e2f4c419c51c6ffa3be2c259115f21 SHA-1: 604ffb43505922eee28c1f896aa53ee918c01210 SHA-256: ab744584b725ddeff3c11d0929d9bc086058c2458503a46a707085e3e9300a4e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The ML classifier strongly indicates maliciousness. The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to distribute further malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics confirms this behavior. No scripts were extracted, but the primary attack pattern involves directing users to external malicious PDF files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/4dbb37c5877ca3a61a99c9eafcc4f7f3/femobival.pdf In PDF document text
    • http://0-50.ru/userfiles/file/xorojoraxekevow.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/92128160517.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/75207668176.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a622344f84d---37544777919.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4c0915d2e---delozuwurifivolixobopunid.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160abf6eca094f---19532686549.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16097d8de4e7c2---nilupupoxobokexosibexitor.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/0ec5d15ccda8854cfbaa536db6cd5bde/biwinixobajekeduserufar.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/0a42e38186f0848f4e5fe0cd629310b5/sawesalewojosukazakima.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/06b5f84d071b6f2f54b7c22d94f00dae/xonodiwa.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/9455ba90ef89cae70615875362bfcdc4/pulusuxojot.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/4e4fb7fe560dc915216afee96c3c6c4b/dawaxe.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c236ed07547---bedazewuzu.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/74c9e5456d01bcd3222bad26735feeac/71649073581.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d8fa02d4df6---1036394989.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f93108e64---jepuduzisumogurotaridan.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/falobaxeburafuwasu.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/21ce9f174973641174acec21169e6dfa/43992023455.pdfIn PDF document text
    • https://mimpiindah168.com/contents//files/20705333783.pdfIn PDF document text
    • https://luminex.pl/upload/file/nasilafaganov.pdfIn PDF document text
    • http://farashimirooz.com/files/46238974833.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/6c1cc88466c9bc0bc7bbc2fff166d9e8/rajiv.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/tevekijene.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=happy+new+year+songs+tamil+downloadPDF 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_off0000e547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE547 10928 bytes
SHA-256: 502acb8d4748bbbd0f9c032b7bb71ce4f6935efbce38df30b5df2ef577b1593c
font_01_sfnt_off0000fe65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11677 17152 bytes
SHA-256: c580992a5b42840d0c1193bf35befa2bbce2ca9548f23c04fe22bf38d5c08a71