Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcd0c37fea7c061d…

MALICIOUS

PDF

75.2 KB Created: 2021-08-14 00:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 823f0a789aa7d2ce9200e4d0f5188194 SHA-1: 4675de9ff01abb749cfea61fae108ea250322ad0 SHA-256: fcd0c37fea7c061dce7ce213704c32cfe34bd95d9246ea318fe61679366a6db2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to external websites, many of which appear to be hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate the file is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://laborke.ru/uplcv?utm_term=lesson+14-1+scatter+plots+and+association+answer+key PDF link annotation
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f53c2febd---selovitunebog.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/bf7d2ae835df6d16e6654371b4bd9591/nudulogibolinuru.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/87802462224.pdfIn PDF document text
    • http://hoggard1975.com/clients/a/a4/a43fc1111b7ad4318f8b553feb79a890/File/57620586400.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/020053278181.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbde796dce---42066537177.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/ac254b5297ec329a52e8fa1ab5585d4b/71640624468.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a3633e6790c---nawowogitimine.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0de586097---wamajutekesagunivubugene.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/0f7b3a122ad87d78e80916e3685e8763/resovatogi.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/49199037685.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/motozelu.pdfIn PDF document text
    • http://17njl.com/userfiles/files/nelasi.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074845778683---refuxamugafefijidun.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/jotawazolamoze.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072471d4ce84---fajalusixijavazisuburida.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/defenukawuneramozutisi.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de796d00047---wediwonenasusor.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/65626599438.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/44011559294.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/4a4d9152d54f2c7fc7501b0e40a5bc0e/futimejubituruv.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca0e44b729---lijivinaladexobewerufivi.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/e5043fab44041c4ed958c1a746a044d0/56991537144.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a4bb53f83---jesajojejepokagera.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/7b8m1p4in56nkfdq42gdbthtjk/25324903747.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/b41c6d98a437f5e568cf3b8be8f2010c/febetadunipi.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/dumixevuzibajebuwokewe.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_off0000c382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC382 10920 bytes
SHA-256: 3298afa7ad406f3d93ab4165851772f3ad3d0376a71aca8aa2580a78b1c8791a
font_01_sfnt_off0000dd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52A 16300 bytes
SHA-256: b32b7da5decc5c4b86d04315e2c8f538501734e0386768c6d25054468a8b7960

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