Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ed8466d51ac44d…

MALICIOUS

PDF

80.0 KB Created: 2021-09-09 10:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b376a2ac5d386e7f626ba969a6a82242 SHA-1: c722df4fede2e0ad1d8932da18d8e7c3c6b10a67 SHA-256: 21ed8466d51ac44d9b6cd101d47100829d31c147079defb57a68d6c3a2ba2f8f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to potentially compromised websites or disposable hosting, forming a link farm. The presence of these links suggests the document is intended to lure users to external malicious sites, likely for phishing or to download further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://nomylo.ru/uplcv?utm_term=facetime+calls+encrypted PDF link annotation
    • http://sieuthimaynhapkhau.com/upload/files/wopugafirosaja.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/2b1f123799fbd191a21881fc600e18d1/purikipunelivo.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/ed09b17440d4ff7789861e06535fd394/61892082344.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/61608195377.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/mojopimejeza.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613955064ae04---15452147203.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/pekeposamozisib.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/83357914161.pdfIn PDF document text
    • https://digireg.cn/upload/kiwurepatonakumimad.pdfIn PDF document text
    • http://zhymwz.com/upfile/file/rabobiloteb.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/7306110935.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/tarerototomuzimuwoluxeku.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613681dfacba4---2783085747.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/damovedugi.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/93213740133.pdfIn PDF document text
    • https://empresa-venta.hr/files/davusonupejasul.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/givumulamuwuloraj.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/pulezor.pdfPDF link annotation
    • http://cosyromania.com/media/file/dajakizeweteb.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/muvixavetirotijerinate.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/86756175982.pdfIn PDF document text
    • http://knipia.com/userfiles/file/94281508377.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/87336816989.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/55510642355.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/54095135510.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_off0000d6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDF 17048 bytes
SHA-256: 8ec532e80792ff6f1dbbda440fb07e2b4cd7acc33abb11e4b664350359f30b11
font_02_sfnt_off00011a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6B 10648 bytes
SHA-256: 4c9526e35c14956e962ddd25c1aaab0ae909f3ed1cc1b6fafc2b112f58c3e840