Malicious PDF — malware analysis report

Static analysis result for SHA-256 36d8f8ac1c0cb67b…

MALICIOUS

PDF

78.9 KB Created: 2021-08-27 07:37:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 54cbd82293232477cc13fa8d15aa4ede SHA-1: 29ffbfe591bc2e23e86c1db5a3ebd4bb7e8d2e31 SHA-256: 36d8f8ac1c0cb67b00c6acf04b0cef923ef5896219ba4365fc117f74a6f08017
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed for phishing or malware distribution. The presence of embedded JavaScript indicates potential for further exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=russian+cabbage+soup PDF link annotation
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/98ccc8e9cae7ead16ec736b45ab1e89b/54168882470.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854970d6d2c---mabolarum.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/gofimap.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/40068981406.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/zibolawebonurugido.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/49350092449.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/magonefupabizupu.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c884ed2d6---wopavegekovi.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/61189704447.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/lenakafovexepopixef.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/9466f7b9c40222d6478225fff4c2fee8/11325440918.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608904bd90a74---xixap.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/d33657c84b93ee20f9cd7bf6af68b26b/vileditediruk.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160825ce0ed7e4---rekojanimesewewumixananot.pdfIn PDF document text
    • http://gchs1969.com/clients/867877/File/90040282196.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/be465e478e0c97c7bb62af8b21798364/vilatapiwumebunukatuj.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/83261627448.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/90521298627.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/b35c1274c550e2d3b18f4c1d99406785/64753792908.pdfIn PDF document text
    • https://ocw.tw/uploads/files/tetujetaxisenaw.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/4194673981.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/a73cf03e516a1daccd9322244d51995e/lojizaxidavigosixowe.pdfIn PDF document text
    • http://splogservice.ru/content/file/wesizekaxur.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_off0000d072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD072 16764 bytes
SHA-256: e6289b97ae111a08e7487131db209bf5b6547ff4bd4c72944d73e66b61658269
font_01_sfnt_off0000fbd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD4 10592 bytes
SHA-256: a175c6e48908be7462ae487891db9fd62f19ce3ad33339d670fd063de00be367
font_02_sfnt_off000113ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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