Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d6bbd93239ed802…

MALICIOUS

PDF

82.0 KB Created: 2021-09-21 03:31:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9d7844926a80d0df7bc5c7a80d23c16e SHA-1: 8ec54a47a2c02eca61af0c25e2664bc6ba740009 SHA-256: 9d6bbd93239ed8020a76cab61be526a1c4c0b27293f555c9269aafb42d1e8769
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URI heuristics and the 'compromised CMS upload link farm' rule indicate a strong intent to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://coretry.ru/uplcv?utm_term=we+20012+apk PDF link annotation
    • http://bolt-go77.com/fckeditor/userfiles/file/41356324872.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/tosenepovigenoxujiweduwad.pdfIn PDF document text
    • http://vaynhe.com/upload/files/61341750009.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/nuretovamabejufaxo.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/tepefufumoridem.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/wexonixubotubex.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613421578e2bf---zonewejavi.pdfIn PDF document text
    • https://majubesar.net/contents/files/86383964333.pdfIn PDF document text
    • http://vit-physio.de/file/32830538254.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/tikedotuta.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16132907558057---sudufujusosupomedexoduso.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109050036168724.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/6576676795.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/vugejevutijavut.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/zadadedajopaxux.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/47045939123.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/bepafugeremiba.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161360daeb6434---3215275358.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/tobugimexavatekutopakodu.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/kedulaxuvoko.pdfIn PDF document text
    • http://mayjack.com/upload/files/74595709095.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/84390537774.pdfIn PDF document text
    • http://schturman.ru/files/files/dogabariravobubir.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/limagumosovupo.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/sajivivivutufukin.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_off0000da2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2F 18992 bytes
SHA-256: 87c8d010018ffdfb641b8307a1f51a062c6dd24a24965f791ba0974498fdaf52
font_01_sfnt_off00010c1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1D 9896 bytes
SHA-256: e1b99f9bfb96d9dd1121a525ae70a3c017100697ad79b90a1758bab81d66dda6
font_02_sfnt_off00012235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12235 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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