Malicious PDF — malware analysis report

Static analysis result for SHA-256 def790f122597645…

MALICIOUS

PDF

71.6 KB Created: 2021-09-10 09:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7e61bb479d876fe279dec899602f4678 SHA-1: f73faaa6fcd89e0a637d9276df027da75998baa6 SHA-256: def790f122597645b7d8b50bc9f4d6ebfc7a315e2ae24d8cd1609a0fb04fd38c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm designed to redirect users to potentially malicious or compromised websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to exploit user interest in free content to compromise their systems.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://manajrgvaaradhi.com/cms-uploads/files/26101392451.pdf In PDF document text
    • http://www.hon-ro.hu/userfiles/files/fudipajisatenijabirozunum.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210906081008.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/94422082673.pdfIn PDF document text
    • http://hotechike.com/files/files/velevosapujume.pdfIn PDF document text
    • http://hanyangsteel.com/files/fckeditor/file/194533981361335dad6e64f.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/berusujorexa.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/xibapajumo.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/gutaxokejatari.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/39088223307.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd1bd6c32b---zisubugaziganasamere.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/dudejobuwiwebisozi.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/856160131613878b5d3d5c.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kozorusi.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/50855609678.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/41136273543.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/takidufa.pdfIn PDF document text
    • https://gornjastubica.hr/files/vanor.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139413356a7c---tumiwidokedubotibejiforod.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/013808136dbde9609bf81b4bfca51a66/88828002144.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/21020677953.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/joluwaki.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/xelekudifepusep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=free+movies+and+web+series+download+sitesPDF 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_off0000b7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7F7 10676 bytes
SHA-256: 96f7321c835021767e37ffd6d013fb370223ec9e080d657dc5a53e21b1b4d1e6
font_01_sfnt_off0000d075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD075 15884 bytes
SHA-256: 2e5cb49d3d0a390bd8b7a0a774545ec7cc5a0b2ab9efcaac53b03cbe8f032ea5
font_02_sfnt_off0000f8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1