Malicious PDF — malware analysis report

Static analysis result for SHA-256 9972b6b4a646df48…

MALICIOUS

PDF

70.5 KB Created: 2021-09-17 12:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3f95f7503db468b5388d75b68b346ccd SHA-1: 346f62d3c622fff6cfaefec9978eeddf3db23209 SHA-256: 9972b6b4a646df48d8e5212d3b225b10e47fee5893ebebeaf1ce49c9170c543b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS platforms. The presence of these links suggests an intent to redirect users to malicious sites for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://promocode.lu/userfiles/files/14390910555.pdf In PDF document text
    • http://alfavs.eu/userfiles/file/68414731088.pdfIn PDF document text
    • https://hoalavender.net/upload/files/wogigoreg.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109070234381800.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/39004549707.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/87453781469.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/fef387875702b5b3fe23dc771d995d1c/nobemux.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/58297084224.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210909170237.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/podarulojeb.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/27604046854.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/mokewagavegat.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/v52kdk9acirns97ektipaaegd1/sunufisigiramawukupat.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/14015523681.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/satejuzigugezupujipe.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/7028645162.pdfIn PDF document text
    • http://jarosi.hu/files/file/57640811559.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161306bb59cb4c---nekosijuwalabinigokip.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/xipudib.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/52019325982.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/tisenajifiwomafujo.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/28608071345.pdfIn PDF document text
    • http://myphamso1.net/uploads/files/tunetalug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=iphone+11+pro+max+price+in+bdPDF 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_off0000b343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB343 16000 bytes
SHA-256: 53ecaabe52957ecbcda376c56dc74178a3399444fd2e7da3d696c8ec481fa9bb
font_01_sfnt_off0000dc55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC55 10712 bytes
SHA-256: b9b6e0483486c1ebb6f1a66a242f254b3d077b061753533313dffc851f30c39d
font_02_sfnt_off0000f482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF482 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1