Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6a94a742b140c92…

MALICIOUS

PDF

83.4 KB Created: 2021-09-19 22:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ee0486423cd0a8542528eda819b27e3c SHA-1: 3aed2cda3d47904a0a35eaecc9355dcc97b65014 SHA-256: e6a94a742b140c92b3a8b7f9f77321d3f34bed442f55eeffd5ed192fd69f5116
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://pistant.ru/uplcv?utm_term=card+coin+master+hack PDF link annotation
    • http://fosterfreezesantarosa.com/uploads/files/16023106851.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/lexogis.pdfIn PDF document text
    • https://ka-base.no/images_content/file/lepigivemafikozibo.pdfIn PDF document text
    • http://e-sheremet.com/img/bagokujonizilizivalor.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca18f74420---ruparijujewidider.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614380d6b8dab---binanafax.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16134136840547---25946274271.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/84703265915.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/samesewikofiwuj.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/20020630698.pdfIn PDF document text
    • http://theponghop.com/upload/files/migubanagidosulazonure.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/jupanalasimozanekezomebel.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/21p79fd0q9of95gqu58utft6af/menuxutesujo.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/nukevazisojesawem.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/mogonobu.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/35538244323.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/5399300953.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109081712033439.pdfIn PDF document text
    • https://businesslife.com/content/file/ramajok.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/c066df9a68e7fdbebdf578db5755fca3/84815153063.pdfIn PDF document text
    • http://alptw.com/images/files/42208571008.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/89bf1086609cf0c2eb12e9fc55c375e3/81429814216.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/jejoj.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/moxobani.pdfIn PDF document text
    • https://inprovitbolivia.com/ckfinder/userfiles/files/gagivamefapilisopijaxom.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/90164203277.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/cb566f7214986ebbd1617d4a6c20760e/nakabetiriwaxugugosopem.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_off0000e11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11C 17912 bytes
SHA-256: 35718d1f247ca64c1b0fcec2d8f4953a380a253ccc7c95214157016da7cee37b
font_01_sfnt_off00010fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B8 10712 bytes
SHA-256: 9d6d498e4d330fd0800a2657a24af487f3a8ad1d07127cd2c696f018c19ec44e

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