Malicious PDF — malware analysis report

Static analysis result for SHA-256 c327b6b2404528dd…

MALICIOUS

PDF

81.0 KB Created: 2021-09-06 17:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 617a3e8f15c308f5fa9ff7045037a43f SHA-1: e094ed19b29a530b8977f498e6a7836a77489073 SHA-256: c327b6b2404528dd53a14837cf55522fc8dd36f4d32b5f531afce490d2554e7c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5210

Heuristics 5

  • 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
  • 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://pui-vital.ro/msg_media/file/30457543618.pdf In PDF document text
    • http://inciboya.com/resimler/site/files/75028497864.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/jesatomirufoluxux.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606f63317a34a---xanosozelide.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f332d165dc---dibedox.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/27992471661.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/g1qe79qepikv4ehvne9qh4vto3/51111557763.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/f11272d52b797366c63f999cf6f7d5f9/watimazofenonuwivukemeguw.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5729fd6e0e---15527052538.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161084621db632---37366982195.pdfIn PDF document text
    • http://www.edgartownschool.org/uploads/files/kumam.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210902140905.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/editetewiwusavu.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16084ad5dc4c33---76714230292.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/zipaxejipejuweparuxezur.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/pugipenok.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/31836078689.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/8b581d4dfc6070aee2dd43917670f865/malanonufedurina.pdfIn PDF document text
    • http://amdind.com/userfiles/file/30750225761.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9dec3ed985---90045642508.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/duwosevaberox.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/pivibativibav.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc025436667---kowesuraw.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/nokuguped.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/v4v58lnc10h2vfg8k1mu28l456/bewurokes.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/b0c15aa9c56a995d356e5fc288f6da00/78428111972.pdfIn PDF document text
    • https://vieclamhanoi247.com/upload/files/xizilusevagovid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=a+topical+approach+to+lifespan+development+pdf+downloadPDF 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_off0000f138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF138 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001094a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094A 17900 bytes
SHA-256: 8e663991d26724ef1e423662f79741222d3051ba010bb046544191d246a6caa6