Malicious PDF — malware analysis report

Static analysis result for SHA-256 b31c9a469fe314f9…

MALICIOUS

PDF

73.7 KB Created: 2021-09-24 08:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c8aaa811fe80aa185d75e5abf139b7cf SHA-1: 872952a4f946dd4bffb022703621d9ac237cfb23 SHA-256: b31c9a469fe314f9d4f9c7ee4966f3c885721ef201dab42dbd4a4927f92846d0
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms, with several pointing to compromised CMS upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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=eddie+glaude+democracy+in+black+pdf PDF link annotation
    • http://robwalker.net/fckupload/file/ruvepuruzodol.pdfIn PDF document text
    • http://djpress.pl/Image/files/kivavawefuxebimosupudip.pdfIn PDF document text
    • https://parc-hotel.info/file/21983141920.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bcfaa963c---zenijevipituxuvewuzem.pdfIn PDF document text
    • http://djpress.pl/Image/files/wotogekazojekedozaxor.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/9ec3d6a8d71242368c40fee001874359/pozugikejovapuvonap.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/xufimotanovopovaxifiv.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/nubewepawarexovotu.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/70237338565.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/3b85c6f34e4cbef2e317bbbac0997a69/puzawavafodenixeko.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/vikogowufasovolebire.pdfIn PDF document text
    • http://www.moyekolodin.com/files/jeveda.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/161302c988f644---pokinozarizukidalepip.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/dikub.pdfIn PDF document text
    • http://khachsandomino.com/hinhanh_fckeditor/file/dufek.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/mamadowuzepujuruwamisotut.pdfIn PDF document text
    • http://friulanamarmi.it/images/file/11614518609.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/sipesakaru.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/60238528250.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/kigikuzotakes.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/65914771135.pdfIn PDF document text
    • http://snft.ro/media/file/bameja.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/tusipub.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/dogatozonesijinuzunega.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/61660815382.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210911_804A84248E90CF4B.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_off0000bd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD8A 16244 bytes
SHA-256: 8308eaa2923bb50c12195b09c12389fc01d27ce87bb44d99e9b5af3b3f448019
font_01_sfnt_off0000e70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF23 11128 bytes
SHA-256: 99b31a492ee4fb7464105e0bfd3fedab8a817857cee445f46dca69ed19a7bf29

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