Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0e73236b7367f74…

MALICIOUS

PDF

78.4 KB Created: 2021-09-07 03:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e71494bfd431eeee5f160f6ac4931c7e SHA-1: dd97a4534ce7abb08d82b074e77760a3262059bc SHA-256: e0e73236b7367f74abb61e09035d9f9b90cc2a7bcb2247c39a84aca7525ca21c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document that contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The document body is heavily obfuscated and unreadable, but the presence of link farms on compromised infrastructure suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/71c7c7acbb580d12e1614d044a335a4d/pubenosuzasuwibos.pdf In PDF document text
    • https://gkia.org/kingkong/userfiles/files/27784474648.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/2sgn6qqa66t1asq8g6cffj7mth/punowasagaxeli.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863f458fc6a---29533173501.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607159820ce56---61275977826.pdfIn PDF document text
    • http://clingac.com/d/files/fupejexesemuguxizijefux.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4999266b9---natesapo.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/62b6ccf2613e32839c7cd87c708ed533/2115537792.pdfIn PDF document text
    • https://callalilyvn.com/upload/files/munuponuvokajatewirezepev.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/wujedagoda.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/92964269803.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/sovenedof.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/kubug.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/20755538493.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/10243486988.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/leritojalo.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/fk0tdg0aeabij13831b8to6tq2/1110479615.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/414d88e37e5fe22d22b210d899d4ffc1/46474960382.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/84279484102.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/nhg5sd9as11rluhvqlf8ao6j50/41610239248.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609053ec5bf81---21592025295.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/49104160508.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db5398cfa8---24876456889.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/85a84a9ccc78f7dfa18268e7b5bbb738/87153394093.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=learning+styles+kolb+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_off0000cea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B7 16592 bytes
SHA-256: 41e7c0a994433c6c757ea9cb4450686dfd15063b37ca5133a6873cbc923ebc48
font_02_sfnt_off00011160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11160 10976 bytes
SHA-256: 3c1f5b3e35b2a41462dbfd5fe72a8fa67505f864662d3223104e22434a7de82e

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