Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d63b9652e75e621…

MALICIOUS

PDF

85.9 KB Created: 2021-09-06 19:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f860ec6c452456129b8946f206b820be SHA-1: b6b02cb7a897141b0c08186c1560d57149fc14ee SHA-256: 4d63b9652e75e6213815447c9612f0895802c52bb52a1bb91c5011ac43ecbe5c
124 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to disposable hosting or compromised CMS upload directories, indicating a phishing or redirection attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. No scripts were extracted, and the document body was unreadable, limiting the analysis to the link structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4722

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://treasurehunterdetectors.com/ckfinder/userfiles/files/14915322076.pdf In PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/1e2fa191fe08ee4ae395e398c99f17f9/18074021766.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/87837838611.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/magevofadinusigowe.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210603092859.pdfIn PDF document text
    • http://ccsilver.kr/files/fckeditor/file/9546826956100214ca758f.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/47745896486.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/domusebobomuwapitevem.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085330878f33---37226925243.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/a7qbk3te2pfgspcn17jl2dcccm/95531445656.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/dirovazefek.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/migadarusiwasizeriva.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/xodunubamenibiboduval.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/bezekujevilene.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160947393da964---97861421151.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/834e09e3191a78f596c81ab41340ba7a/70141445969.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/875daf07fa7380bb2df9c0f53aa73009/88534617795.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd632a7885---joxivigarukogudabo.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/43845095252.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210818_111631.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/kotijonudatabupazedidan.pdfIn PDF document text
    • http://whs1979.net/clients/65916/File/jutolaxizabamenoso.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/13412706327.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=cthulhu+mythos+rpg+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11410 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C22 17992 bytes
SHA-256: 90dc6aca46376526b775a36a1d55bef8eb072d0b37238dfec4269804eb3e939d

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