Malicious PDF — malware analysis report

Static analysis result for SHA-256 66cb753cc2e086ce…

MALICIOUS

PDF

163.5 KB Created: 2021-06-26 02:13:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e5a0949f4b86a5a5fa0ee0b6613e95f2 SHA-1: 41f33024328511a8c13a0c9c60a2e99988bd1bb7 SHA-256: 66cb753cc2e086ce8a54c54cffd6431c6ad5e5fe274e945767a44221ed870279
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or distributing further payloads. The PDF structure and embedded links are consistent with spearphishing attachments designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://huntic.ru/uplcv?utm_term=antioch+in+the+bible PDF link annotation
    • https://apc-algercentre.dz/ckfinder/userfiles/files/doxapebusamuvuxupumaru.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb4ca2d930---bavabukeratijinu.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8034bceb5---4297897982.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/dbdd6aac8241a4b84a8ef74172f4845c/sogevubaselatov.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3ee859f42---78036228904.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/55720531988.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/89549107597.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16097a7e831af8---nemasab.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072629a0ee2d---51236116663.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/39993004754.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/p10rue1ib1254ppbrjgdq0gp50/wiberopovafepimes.pdfIn PDF document text
    • https://signika.pl/Upload/file/30337175960.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/26724007807.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16080235ab1cfd---towulusixixadisinexi.pdfIn PDF document text
    • http://mega.kz/media/upload/files/32840734726.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc4d871a0a---18430508998.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/59888459653.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/nupagubom.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/59193550807.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/ce2dvv7n98v663knvu08rj4f00/64848581820.pdfIn PDF document text
    • http://chromavials.com/d/files/52175567703.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/ico3uc0ecronncbhko3bvjj1v6/rivutufijogakene.pdfIn PDF document text
    • http://zzliuxue.com/upfile/file///34971555287.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_off00022565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22565 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00023d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23D7C 10020 bytes
SHA-256: a0007d90b09c742562c1f18e03638546ea1464dbfd78411505f798f7916cde2c
font_02_sfnt_off000253a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x253A3 17260 bytes
SHA-256: 1ba31bf63d4d939d536179b5ebea9af0996b37cd74d902b14d1847add52f66b2

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