Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c6f9cf5676afaf8…

MALICIOUS

PDF

69.3 KB Created: 2021-08-22 04:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 44b5e861bc06d15949baba22c0b57bcf SHA-1: fdc9fcb15223a41eabeb5ec1d6ae8896af06fe4e SHA-256: 0c6f9cf5676afaf861afc2c92c4025dc03be5c462c6ea99d63295a4b37e7f81c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS upload directories. The primary purpose appears to be redirecting users through a series of links, likely to a phishing page or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5557

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 http://specimport.by/files/files/77990849778.pdf In PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c454886e2---19664052664.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/asa9u4a2814fp4odibnmvsq455/wibivosoxumerenubog.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/resegenepituworufutugabuf.pdfIn PDF document text
    • http://rolfingnaples.com/clients/a/a5/a5422f62036d2d393d866963e902351c/File/ziwenivoromizi.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/54c6bcff688819dad77e0cbd1eb09138/mejuluxijurexutimuf.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/231302424.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/54644098298.pdfIn PDF document text
    • http://delshadian.com/public/userfiles/file/winekizodagadaxelesumaken.pdfIn PDF document text
    • http://fabtur.ru/upload/files/sewuk.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/xuwameza.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/5560362943.pdfIn PDF document text
    • https://campermagazine.tv/public/file/lamobadeniriralutagu.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/ginilupukuvelejusuz.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/fuzojulujipasew.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/72005233243.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/11350890601.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/dokafu.pdfIn PDF document text
    • https://orrizon.ru/images/file/25197499657.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/39316261802.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/47361178794.pdfIn PDF document text
    • http://qytbearing.com/upfile/file/lavefajizexoxuwekawafumux.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/puleg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=afrobeat+instrumental+to+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_off0000c6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F7 18776 bytes
SHA-256: 3ded9aaca2ef9e6c6e95cee9882111b9cda0db582afcb602817e0619031ab472
font_01_sfnt_off0000e4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DD 16612 bytes
SHA-256: 9f02a4964ae6d1bb7911d7768c37993519fee17eb15c8d3e58417c9315875ef1

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