Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ba8f5cf0223f8b8…

MALICIOUS

PDF

77.2 KB Created: 2021-07-08 04:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: c8b236a7d8d0414a0e44ea206fd87eaa SHA-1: fedded3de45ab2adcbdb08f4bb5de9954bd0ef45 SHA-256: 5ba8f5cf0223f8b882a307d0b6bd4bd28c57ad4c71287c3870ffa01efa460d7d
96 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, supported by heuristics identifying the PDF as a link farm pointing to compromised CMS uploads. The document body is heavily obfuscated, but the presence of numerous URLs, many hosted on compromised WordPress sites, suggests a redirection scheme. This pattern is commonly used to distribute further malware or lead users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4405d7f9e8---nagogerufabevava.pdf In PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083efd791b92---98473981988.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/28e9o1f6hfj2kljh0f0fcb7p03/mumajebotam.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/070159f3bd7a4df9dfdd7be430260c5f/davir.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/46d95c588787e1550ccda3e207c729d3/24079418062.pdfIn PDF document text
    • https://memoservicesrl.it/file/wezir.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ckvlkd28hmldqcdgijn0gkee1v/fekonoluf.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-18/20210518133818275518.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/0e4aee8a0bea119eb21e9f337d1c7751/kewojuleluwotaderar.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/57314699021.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/6ffc023df8fa5cc5fe85f6f135dd51fb/68555001674.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/71d0ef550bafa5dce48ff5dbcc5fc41d/tedonojejafodikidalazi.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/28474093651.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/tikakoxobukijupuvutaxofu.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/39763542409.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/36f9f2ec3be35c4d474fe8338f7830aa/mawakokubipirigabegomo.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/0dc3f0623a48ec676c3f9adc15b817e7/2715724329.pdfIn PDF document text
    • http://danielbushreunion.com/clients/41596/File/japiziwifibutedepevuru.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/17749006358.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5e4618198---munep.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093b7bce8ad5---26263283588.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607626492cc34---69496978266.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/47daa8784b8bae3f2124c9d1fc97496f/jokesabekofeborazebilaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=happy+birthday+cake+with+candles+name+editPDF 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_off0000cbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB8 11084 bytes
SHA-256: 6214e4b2317eb94f0553e0bfa2cc999887c7140c447e047bc002b4d9e2f73563
font_01_sfnt_off0000e531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE531 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD43 16316 bytes
SHA-256: 735d95a7d8093a282e97b20d8e62a96d426d3fa306daaa8a8c2f2175b2e0f53e

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