Malicious PDF — malware analysis report

Static analysis result for SHA-256 23e13af5efdaf9f1…

MALICIOUS

PDF

74.2 KB Created: 2021-09-13 01:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: be588a776b41c8500e686d20d6e88aad SHA-1: 6fe533e4c7ceece9a6cb9255fd3dfec8900d5664 SHA-256: 23e13af5efdaf9f1d5b527d7f03967c8296ae917ece5817778dde4972fd6afc9
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on potentially disposable or compromised domains. The ML classifier strongly indicates maliciousness, and the presence of JavaScript suggests an attempt to execute code or redirect the user to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further support the conclusion that this document is designed to distribute or host malicious content via a network of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=lost+in+translation+putlocker PDF link annotation
    • http://1-champagne.com/blog_images/blog_/file/riraretizeluxesuperubozed.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/vaputaxuleri.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/16437777939.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/90358051128.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/89740806482.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/gelusidaz.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/7dd0520ab51cb5e308671cf17bc6cb1b/buwovaferoxokab.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/13541372145.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/xebodajavilumalatoti.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/bajijoranabubaz.pdfIn PDF document text
    • https://kimansion.com/uploads/file/jemur.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139dfe29fcad---wilatibizo.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/70948438653.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613954fe2768b---lemerisezalefo.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139459012b61---tuwadake.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/b21baeop2750v8qc7878iksder/6367050585.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/lekavebufe.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/gogeja.pdfIn PDF document text
    • https://menu2uplus.com/images/file/jabob.pdfIn PDF document text
    • http://sabaparsian.com/ckeditor/files/files/44775532124.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/74359602540.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-10/20210910205722814674.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/56504911150.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/72113204479.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210911000952.pdfIn PDF document text
    • 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_off0000be75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE75 17196 bytes
SHA-256: 2a35310076ad51ec940cd8f75c566bcfedea21b62f2726aed28c1f3e6af03e73
font_01_sfnt_off0000eb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB01 10516 bytes
SHA-256: f0497bd55e9decc3e19ed86ceb5c727820428a6ae57e6d3d33d0efed0a80447a
font_02_sfnt_off00010314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10314 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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