Malicious PDF — malware analysis report

Static analysis result for SHA-256 a26c7ff4bbc8aab3…

MALICIOUS

PDF

75.5 KB Created: 2021-09-08 15:17:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: de9e8d4430ee8aecb7d3c775f3146b4e SHA-1: 573353e53f4667f031c978d385a55c086a21f19c SHA-256: a26c7ff4bbc8aab37ba7bc9e032a21aa397c4e71e1e86994737e915733a7104b
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 or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host a large number of links, likely to lure users to malicious sites for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://prmakeup.com/Image/files/wevazi.pdf In PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/watadumumanadadedemaza.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/53020215462.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/pivowaw.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/xofakoda.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/ginibaxa.pdfIn PDF document text
    • http://tuzy.pl/Upload/file/zalozexevubagexigowu.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/87534379919.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/tolebotowovife.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/risosusovaludoduwi.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/begotogagos.pdfIn PDF document text
    • http://floridare.ru/app/webroot/img/uploads/file/260104_sosumefebasetuwobal.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135787c34a69---munuji.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/tetuwaforiwuniniwipibuja.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/17530054656.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/nobotupu.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/728f975e6c2e2fa1a7f3fd7c05000c3e/femixidemu.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/pazezemuke.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/bezutun.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/86254872631.pdfIn PDF document text
    • http://polipack.ru/content/file/wafaxajetumabepam.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/pinojulilimapizaranafaput.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e7e3dca48---xenexitatubonagimijivo.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/23504079668.pdfIn PDF document text
    • http://neodermclinic.com/file_media/file_image/file/dewibolojodinadamumi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=pe+national+curriculum+ks3+%26+4+pdfPDF 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_off0000c265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC265 10756 bytes
SHA-256: ee3304fcce5daac437a1b65df5d534138bb7d18591affbfbb2fceca1b88d829b
font_01_sfnt_off0000db2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2F 17400 bytes
SHA-256: f838ab3e2050f45720f326976eeb090139f35e3fb840a7b65164697b0a5717ef
font_02_sfnt_off00010848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10848 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1