Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b5e3db199626e9a…

MALICIOUS

PDF

93.8 KB Created: 2021-06-30 17:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 91ebb86b15a24ea77e46e90e6bf1e08b SHA-1: 422c152649a4420c63e16d5d9ddfe417a4b2716d SHA-256: 4b5e3db199626e9a75708d734c69d3d0f7bfb8b6bc2364a18393f2fa6215ec22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories and disposable hosting, indicating a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160770c1fcab4b---30019570712.pdf In PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/59549901687.pdfIn PDF document text
    • http://transinfosoft.com/userfiles/file/joturenupadem.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/8a9d96e08fa8dc94035f11af05215062/4013073216.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/65514949027.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/4crhn6loe4ql5i7lmtrflf2gc2/gojatabisobilulixowezoler.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/mipavumusalumebidoku.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210608231013-nabalemebetig.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/53455252650.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89a0a70c7a---68966724632.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609630d5f3395---61004979649.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210628015758_946529678.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/efc5d0ac0fd8ba1d34aabf5465011d8d/dibal.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c06ac9dc2d---lajigidujirowetof.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/bu0ar9igmfiiehcu98ghpchr0h/gavixufitu.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/5bfk9co47c2q6dou9cuib1jf9h/96570852891.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/xilolokikiz.pdfIn PDF document text
    • http://www.bash.cl/media/file/kazivovunimikitawunis.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b8db0e6e6---mukururulefaxugaxomi.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d847dee4d9---lawinupomakarabijalavo.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/joweveg.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/31457178593.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=plant+taxonomy+lecture+notes+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_off00010753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10753 18064 bytes
SHA-256: 938d4a538ecc08a9376275ea8f8d987e00e1372217cb845f4f791ed3d9d8bb54
font_01_sfnt_off000136b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B8 11004 bytes
SHA-256: 5c074224e374f8cc5de0e851f9b42ab9d4515ad65c68e967dfad21286665cde0
font_02_sfnt_off00015067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15067 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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