Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee5f6d23931083ff…

MALICIOUS

PDF

96.3 KB Created: 2021-09-08 21:15:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e19b835ff29c1dbc5a5c37d457370d0e SHA-1: f3c13d0a81e3d59b97f15fd5bc25bfeb7467a599 SHA-256: ee5f6d23931083ffc3fa914e4a19e82a896220dcf8c14c88f649a6204bb77ee3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to other PDF files, many hosted on compromised CMS platforms. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a deliberate attempt to create a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://pixomot.ru/uplcv?utm_term=love+me+like+you+do+song+lyrics+pdf PDF link annotation
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/navumarorasazujonuki.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/67343892032.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/nobosaz.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/79480239816.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/uo4hcad1t1ujs2tgbq9hlb3lhr/65462397034.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/nogovuraz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ddef6f653---sezegurilal.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/rofupiput.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/veludarenafepapozopolip.pdfIn PDF document text
    • https://castel.ro/userfiles/file/lefedetoraxogogokewumive.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210904_003050.pdfIn PDF document text
    • https://clinicscrm.com/img/files/69591610117.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/52943139107.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/82037692332.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/sefaxurunodo.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/xaborikokuxuxugivazuji.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/5264845.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/kce3cis0jksrihaodd2kaok9h7/10681450066.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1630454540.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/2001901355.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/39382870361.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/batozopafuxatigemani.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/jeviturufunuminataw.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/39245777277.pdfIn PDF document text
    • https://lesura.net/userfiles/file/bedorubufegap.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_off00011178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11178 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001298f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298F 11032 bytes
SHA-256: 6d73b1d42a56d2e994e4731d491fcc19365cf361932cb1d657b8488621f170ac
font_02_sfnt_off000142ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142EE 18576 bytes
SHA-256: e7246a9f1f1513c190742eae55cceca68556a71361c3c910bfa6612cf402c1da

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