Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d9657e7e36cd5c7…

MALICIOUS

PDF

93.2 KB Created: 2021-07-05 17:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 98de1730edc8644e355209866f559204 SHA-1: b68afbfc9b6e5a422a5f77dc032eceef7590a4a7 SHA-256: 2d9657e7e36cd5c71cacd0aef7b2cc6ae1c6769ed6c7b369d6b1113217b5b20f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content. The embedded URLs, while some are marked benign, are part of a larger pattern of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/04858fe1f638f7fd8d483c4ec179f3f0/xuxaxotilu.pdf In PDF document text
    • http://veraschwemmle.de/fckdata/file/38022578869.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/mefusigebedexeserebu.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/84ec02355b7f2adaaf563a99583ff9bd/97309755706.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/16b317579f1b4b55c6761b244a9da5b3/28553237334.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/kilobamewevi.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/pk55eg6mm3rijbm4chp08v2af0/wokupazarutovevetixe.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/gowuduroluxijurijagoku.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/77381775059.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7ffd1b36c---98962091388.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ca57007b2---nokobunaxafezowugugak.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/wuworifuxugewofewosex.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/wisixebex.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/84386335819.pdfIn PDF document text
    • http://carszana.com/image/upload/File/mebawasor.pdfIn PDF document text
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/58748712877.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16089c109b160d---bajojibimumi.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/pa4bjbu4vjjuek2cs3jfgmdaa3/27187974544.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/j6b53ql5h9erug76r2t9lbbtmp/57210941729.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210629175020.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=wither+storm+2PDF 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_off0001056c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D83 10176 bytes
SHA-256: 574254f96cf926c17fc346f40e565701708f6b54c0c9f9ebebfc2eb471baa720
font_02_sfnt_off00013467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13467 19872 bytes
SHA-256: 67a936c43843598e228d636c6fcfb32295c37c8a50f6e151c936dc7f5e294d22

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