Malicious PDF — malware analysis report

Static analysis result for SHA-256 8be0cf942b83f95f…

MALICIOUS

PDF

76.2 KB Created: 2021-09-18 01:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9023471f8a5ce7d4915939604f45d0ad SHA-1: 0f65389779eb8bf9fe27a233dbeb10dd786f0d8a SHA-256: 8be0cf942b83f95f9d4f8345de0ca968a90f683adb64775bf2cab17f419dd23b
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://etest.vn/app/webroot/uploads/files/tidusivexelawituzena.pdf In PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/82321711932.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1630954225.pdfIn PDF document text
    • https://mrpressconsulting.com/UserFiles/file/lafaxojorasepava.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16130c8d26f5f2---sigafapegefemumivutobesa.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/gubelerurenu.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/82652805435.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/9c23b98d7d06e226a619ae97eea9d1e0/sasanofefo.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/13702680270.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/ee555u5hhkdq6hnu1s9c2qk4d3/zukuro.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/87288133180.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/gafikezer.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144573fad378---73454603769.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/kunibajemono.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/foxipemixepozarekigumovof.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcc25c9e7f---goxemebunetunomekamesexuw.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/zetogodoxumipoxefo.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/noxozalademaxatotukafak.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/bepafopisakotoserapirazep.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/30331329440.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/92835552333.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/borosawawuvevazon.pdfIn PDF document text
    • http://hoaphathotel.com/luutru/files/68456329716.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/53304774675.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=apps+for+tv+shows+and+moviesPDF 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_off0000c55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC55D 10852 bytes
SHA-256: d34b4747ea6d745facaa462d9e6557ecd5c731b55f5cfe3ef42bbce5af80c2b2
font_01_sfnt_off0000de53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE53 17312 bytes
SHA-256: bf5092ff9f8f1fa5549882ee69971f71b79730d6519e68f6a15459231beb35ce
font_02_sfnt_off00010b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1