Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bb3653f654f238f…

MALICIOUS

PDF

80.3 KB Created: 2021-09-17 15:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 987e453a2c008b7bf60418b0241d4396 SHA-1: 47771108701192763195479000206946134f3030 SHA-256: 2bb3653f654f238f6df067f3a3454051a0a5466dec6eb2b2cc12b1221119cbe3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains a link farm pointing to compromised WordPress upload storage, disguised with a "math book pdf download" UTM term, suggesting an attempt to trick users into downloading further malicious content. No scripts were extracted, but the PDF structure and URL patterns indicate a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://spherule.org/wp-content/plugins/super-forms/uploads/php/files/05t24ej9k8hguucdv1ov5uf315/94247545380.pdf In PDF document text
    • https://mandarinusa.com/userfiles/file/1630885791.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/soliwojun.pdfIn PDF document text
    • https://ganport.pl/userfiles/file/vudaxopokubud.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/rituluwuxizefi.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/zewujoz.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16141a59f13082---lipixebaxupoxad.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/b17438af9ece5b35995a9d86a55975eb/44633199457.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/derevopipalafogamop.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/40335321.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/54924663659.pdfIn PDF document text
    • https://masukpt1.com/contents/files/jarugi.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16136f1330784a---41058566641.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/fafijujete.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/wirebaduduxipenimube.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/judemadazofozowisavuguzak.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/39375075797.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210905_34D2F0D1E2A990E9.pdfIn PDF document text
    • http://rsst77.ru/upload/files/gopikun.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140ec19f3000---69267587903.pdfIn PDF document text
    • http://e-sportis.com/images/upload/66691026919.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/wozilizi.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/53935843693.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/febovexezodimo.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/ripasu.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/wakadufefivede.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/26926846202.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/dixesasakidafozo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=math+book+pdf+downloadPDF 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_off0000d535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD535 10412 bytes
SHA-256: 84abc5305a0d54594dbf507733e6893f9f6f3b6748a612ee89fff1baa6099835
font_01_sfnt_off0000ec8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8F 18252 bytes
SHA-256: 5927562743160351043763971ac11d45e5e6a8bbc8f4c57b98dc274f02e0056e
font_02_sfnt_off00011b1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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