Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a6cb9cbe7d1e3f2…

MALICIOUS

PDF

85.0 KB Created: 2021-09-04 05:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 21d94f0d8fa08b4de6b03b1dbd47dce8 SHA-1: 6ba10f8593e5517d680b794b1a62c7a1f3478200 SHA-256: 6a6cb9cbe7d1e3f29f40e3c622868baafea7a12454c397adf924a9ab4af9a20d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ntct-dz.com/ckfinder/userfiles/files/32999237674.pdf In PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/3bb2c77f20363c4b6e8fbf7cbbe43414/11367665654.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/ed1a4200c662d850d94267bdc19f3262/34837089012.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/b34a9314c12d2849044ebe045d8968ac/kitinedebimo.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d00099b88---82957598798.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/22055587765.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607306b83e75c---47026075858.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4084b7c9b---84827612204.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/65075849908.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/womagejekix.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/xesafakuwinuxosi.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210822094951_zcixmw.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/90803655012.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adbe76c23cb---fonoguxawof.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/mikigukuzetatubep.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5f9f3fa26---52066281060.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/sibubav.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad34143b733---57638327439.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/19738648857.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/25162133912.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/94147160160.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116f6f28867e---jufekekatadotapododopub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=causes+of+mental+illness+in+nigeria+pdfPDF 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_off0000e5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D1 10972 bytes
SHA-256: ac724b4a94517aa9d12bece9f49b81b6bc097a3a0031c5f77e0f0d2dc9477d5c
font_01_sfnt_off0000ff11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11723 18216 bytes
SHA-256: 8586549e8ab6ece725ea307553e0032bc02eaa7070086851e2f641cbcffdcdd4