Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c470db1742e14a4…

MALICIOUS

PDF

88.4 KB Created: 2021-09-01 11:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 40bca860192c12a68853bf400deeed04 SHA-1: 964285d83183db067095847e23b2be304e1c4eb3 SHA-256: 0c470db1742e14a44f8570ee18754fd18441a2a5e3d7a6a70dda5d22d5a5635a
156 Risk Score

Malware Insights

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

The PDF contains a link farm heuristic, indicating it's designed to redirect users to multiple external websites. Several of these URLs point to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://notarbrazda.cz/userfiles/file/88744595056.pdf In PDF document text
    • https://actorconseil.com/files/file/kebazorizad.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/07a44a2b55e62032763e6d4d44a02d30/lipasu.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/52170294896.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/33501141227.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612480b68d30b---xolademedazo.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaa1a0c4aa---11961477447.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/97029780798.pdfIn PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/54740500108.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/zokewobevotojedugetoz.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210826_FB4A5197182AE907.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/18005450453.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/64282082730.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/52441757845.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/rizenetozexebir.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/wodelobupagekududufuvome.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/42217935922.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/mebusulu.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b33b90b03e8---lekesavi.pdfIn PDF document text
    • http://markone-tools.com/upload/files/71882986669.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c0c90d734---44254896429.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160fbd8d9bcff2---zajuropomanizojapudo.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/32972949616.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=batman+death+in+the+family+moviePDF 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_off0000f687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF687 17868 bytes
SHA-256: 57f7ee06dce15da19f19c3d7e9a0534da248da210b148b4f5b3315c5377c821c
font_01_sfnt_off0001245c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245C 10584 bytes
SHA-256: 5d81ad0cbc943026013c8212bc968b8f3f7fceaae58441ad077bd595f3765c5b
font_02_sfnt_off00013c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1