Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b056b991bef5f40…

MALICIOUS

PDF

102.6 KB Created: 2021-10-13 20:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3bd5d8ddd3cc9c3977a7d234a9ca6d90 SHA-1: 9b79595836ed20ad5786b05542154cf8cf151c46 SHA-256: 1b056b991bef5f40bb4a97f1942e76585a48e4052a81db1cce53d1ce26c929ce
164 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream and numerous URLs, many of which point to potentially compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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 http://dentish.ru/ckfinder/userfiles/files/kosagavigatalotamese.pdf In PDF document text
    • https://knoxvilleremembers.com/media/zinevuxikodoxobojatisova.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/muvowijori.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/60408264815.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/59476081026.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/gokakenokelalewaze.pdfIn PDF document text
    • http://01host.ru/userfiles/files/51957192346.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/89335026584.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1615bcdabbda52---68470373294.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/19804226614.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/jilexigonufekoz.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/zuzamewaraxomirex.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/uhhkqqn29no44g3jmct1c6oi9i/35684343699.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/95643410403.pdfIn PDF document text
    • http://lilipoupoli-drama.gr/lilipoupoli/js/ckfinder/userfiles/files/tagujatasatefosubi.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210912225801.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/30512630104.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/dopawemupokizoz.pdfIn PDF document text
    • https://exhibitproplus.net/mentorfinancial/page_images/file/xijixu.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/52583986379.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/pugifufuwinob.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615033d08f576---lajarovatuluteg.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/6Zflnl449io/uplcv?utm_term=hades+and+the+underworldPDF 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_off00012214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12214 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013a2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A2B 10428 bytes
SHA-256: f5667d3d1feeda9414af09d161da604ca412206b1ed56d1ba97437b02c8ec785
font_02_sfnt_off000151c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151C1 22800 bytes
SHA-256: e2217bd1828c75389969a1e53c48a4c8bd290d874ed1560ddefc7063e09c7a09

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