Malicious PDF — malware analysis report

Static analysis result for SHA-256 43c9317bbade86f8…

MALICIOUS

PDF

93.8 KB Created: 2021-09-07 04:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f332008cd5409b8c6f77b08e5175b132 SHA-1: 634930dc4d01ec99cc7e330af281236a030992e0 SHA-256: 43c9317bbade86f8eef6be609520f821d5201f84dd749ec0b9a03c0db252f585
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://grdr.org/paidel/ckfinder/userfiles/files/domigedo.pdf In PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/20ccfaa1b344a97dc2a4f7209a0effed/gemidoludulukonat.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/sizurigezudejovopiterus.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/40d8e500ee1a2b205743ff6e35bd5dd4/lesusenapobaxige.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16093c2a9cd2fd---bipiw.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/58e624b412d1fa343befec9925733b2d/17922259622.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/11b5393c06a0100dcbfbe9bfd2199293/56999950490.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/sepanazelovabizi.pdfIn PDF document text
    • http://euro-ex.com/images/blog//file/57713232387.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d315cc71b6---xolifidoneropit.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/13875676507.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/24185767159.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/fesogumonabidebun.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/bobopisugemitikadazo.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/rasomovuwepakogena.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f5269ebaf9e---risuletop.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/8eeb6cba7985188ecbff5f06426ea947/55871944501.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/nuwijaxijawekok.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/c502e6c37d22b2687d984e50fde0d27f/fokuw.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/sitepewoxut.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/91756091502.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/8onnmh5qq1e3mqvd46cfqi8d7d/54234454425.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=silver+nanoparticles+preparation+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_off000104ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AC 20396 bytes
SHA-256: a0c7309f44e92ca3bb7f7bdc7250871e8701f0395f97ce1cd13c722da3c610a8
font_01_sfnt_off00013889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13889 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000150a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150A0 10752 bytes
SHA-256: 64aecc5d910c694ce69430898d7bf89c0c9bd886f95202f196205876cef889f5

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