Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf08900ffd28dc4b…

MALICIOUS

PDF

74.9 KB Created: 2021-09-21 15:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 939f66c5c59455db8550e0b0eadeb05e SHA-1: d6789bef446f5836f2f287fc1b35b6bc131f2976 SHA-256: bf08900ffd28dc4bc82f878f8bd203b0847e69ade3ff46f58f4e099af9c7b377
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be disposable or compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of external URI heuristics and link farm patterns suggests the document's primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://drafthe.ru/uplcv?utm_term=do+you+eat+breakfast+before+or+after+workout PDF link annotation
    • https://angkalaris.com/contents/files/fofebupifojuluvupuxoro.pdfIn PDF document text
    • http://qdjshg.com/files/file/76300184971.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/rilokokozalesalefi.pdfIn PDF document text
    • http://hawaiianhunareiki.it/file/pefobofovorasorevuvew.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/zazulepuliniv.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/78896266550.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/161333b4913eac---96141330588.pdfIn PDF document text
    • http://tyextractor.com/d/files/35548528052.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/sakupetetotugaza.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/977ccfa01e87139c720e2ef852a0a2e6/waneve.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/xalulenazosoxesebazesogak.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/juxujinisesowawawupasema.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/92077527662.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/7985755044.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135863b9f5bb---kowarusemudepafudiwajiwa.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109160143182024.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/mumuwoxawabi.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/fezekatepulojujezepilolom.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/xofotenagobavivonib.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/lapidabu.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/joneguri.pdfIn PDF document text
    • http://apvn.info/userfiles/file/84240391547.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/76545927143.pdfIn PDF document text
    • http://vedepcuaem.com/luutru/files/zimumum.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/vubomevogavaba.pdfIn PDF document text
    • https://mkontakt.com/dat/file/39976131321.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_off0000c00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC00D 17948 bytes
SHA-256: 42dbd3b9d31215badc7a1e5a45e0f20e8d7315d66dbdae4bd1566a01fb723294
font_01_sfnt_off0000ed9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B3 10496 bytes
SHA-256: ae9a388d2007838b4d0dc4a9650016a5d11541ac21c22ac67ae90dc50a9ea93c

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