Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9f9846f43e7a8e8…

MALICIOUS

PDF

81.2 KB Created: 2021-09-18 08:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8c3bde1357d9c4e63b0fa9b438106d4e SHA-1: 255cb925d5baa003054cdc92830fa133843de2da SHA-256: c9f9846f43e7a8e8d9751436653bdecf706bbade34f36ddd944635f3c89a49a7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://synerhu.ru/uplcv?utm_term=vc+locker+codes+for+2k20 PDF link annotation
    • http://nc-israel.ru/upload/files/78322329566.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/rabezumejalok.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b70f2d3c6---dibegofetekenuzikeve.pdfIn PDF document text
    • http://ozdermusavirlik.net/userfiles/file/rofik.pdfIn PDF document text
    • https://ekransamara.ru/files/fagoxenevazurowipizivazu.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/33667304794.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/161403e3317972---torak.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/butadamuterubagukudare.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161303a1540908---44328207938.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/73886973836.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/50123327810.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/59239208805.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/57479646509.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/79572409450.pdfIn PDF document text
    • https://netlandschool.cl/files/bebubixubepugojumi.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/29276569161.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/tudupurakewetudaf.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210910175306.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/69829540927.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021091307283073499.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/19683652535.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/46959836348.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/rutikobuvizalofevofojunij.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/2d59b0f56a99ab9eabfcef9bb9bac35e/84879646028.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16132c5b33492f---8349173405.pdfIn PDF document text
    • 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_off0000d767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD767 18936 bytes
SHA-256: 312f96a947e9a4102b4aee53c0797ccc2bdc23c08fc0408736a8850879d9fd23
font_01_sfnt_off000107d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE8 10316 bytes
SHA-256: 47e2b70da7e1dd1d15f3a47b3054bcd4e4d9ab29d539400e100be1ad25e01657

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