Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd505ef2722546a1…

MALICIOUS

PDF

72.6 KB Created: 2021-09-11 22:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5cb4485b0ced76da75769cb097d96ede SHA-1: 01e75bfeca66b52f576ed4ca0f087a78e900a225 SHA-256: cd505ef2722546a1d1266a4824c367060157c523c1cf9fdea2ea508c722d09e7
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple links on potentially compromised CMS upload storage reinforces the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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
  • 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://onthebroadway.com/CPD/adminpanel/upload/file/21242078217.pdf In PDF document text
    • https://empresa-venta.hr/files/davusonupejasul.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/9307891342.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109021736432249.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/73780679534.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/kajuritonivako.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/27994473615.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/ce34128c9015cc86cfffbf3d50548acc/64343111231.pdfIn PDF document text
    • http://savemaxint.com/files/file/83290534945.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613674ce30669---rigunekobo.pdfIn PDF document text
    • http://floridare.ru/app/webroot/img/uploads/file/183403_61218627579.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/todepi.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/017e2f8b15ecc777ed107c71005b6434/rafifafitavimudinexod.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/fomuxuxar.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1613a68e690710---43074621769.pdfIn PDF document text
    • http://thaymanhinhlaptop.com/userfiles/file/46377172564.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/33663832216.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/kugubuvibazidiwumomedip.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210908_004914.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/14509488291.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/36697336951.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/dupabebegizexevinejure.pdfIn PDF document text
    • http://manu-transport.com/documents/file/tisodak.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/90164732059.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/26628384551.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=the+great+gatsby+text+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_off0000b8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F0 10736 bytes
SHA-256: ef70d58466828f6328297e3be974ae43e68f52dd52a62ec92821ec5cc2cfb77a
font_01_sfnt_off0000d15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15C 16760 bytes
SHA-256: 23a9e02f7c8815ae1d77a5d052b8b1ab399de82d11e417270caae775249d3f68
font_02_sfnt_off0000fc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1