Malicious PDF — malware analysis report

Static analysis result for SHA-256 04099486caedeb7e…

MALICIOUS

PDF

82.3 KB Created: 2021-09-02 17:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8a1adda53e92ff715b93588ed333561e SHA-1: 94fadf4efc9afd0750a2de6e51c7476129ae1e1a SHA-256: 04099486caedeb7e2cec25bb94a9d24efd0c460fcdbd553c740f54a6314a4e83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, embedding numerous URLs that point to compromised WordPress sites and other disposable hosting, likely to distribute further malware or phishing content. The presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest this is a lure document designed to redirect users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad1a36987a---pixewotegubovevul.pdf In PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/ea793a82e09fd9d1ff77e932cb3bf4b2/15904220294.pdfIn PDF document text
    • http://puppiesjust4u.com/clients/c/c8/c8a8d0e690f73854b1e7a5fbb9521f82/File/3872341875.pdfIn PDF document text
    • http://www.andreapondika.cz/file/lewetorozevukatokovanaw.pdfIn PDF document text
    • http://fitviewer.biz/files/file/58130256338.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad624adbf79---ragofajutexedeta.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/genefixusijazaboruso.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/908ae8f893024d893f94eca0338b01f3/26333387874.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072480b1fa03---17383515214.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f146f128476---satuk.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/wikojevej.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/nifejikosagapawofadez.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/luxebatadatojiva.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/gebakexetezulagavujif.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/dnqfrp363lujlk181go0kc0gqg/79422540721.pdfIn PDF document text
    • https://olterus.org/contents/files/8800919978.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/a2b7c738fcecff1ac5c95973e0366e86/97723823867.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/zewazamapisujeba.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/mhlciegcio5jpjmdrtuat1ska8/47657611606.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/32876cb3bc1f6756a50f1bde62205a78/3786828324.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/xanuna.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/12916662178.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/82229678693.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/f417p9lr2rjnvka7km3as406tp/87038052851.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=fractura+metacarpiano+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_off0000db4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35E 18568 bytes
SHA-256: 048fb4ce483db5634ae7af18da87dd22b7c9b28f734679776201fe7aec3ea431
font_02_sfnt_off00012314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12314 10644 bytes
SHA-256: 7847802938acb37b9fdb868fe13c51341112b1f1d854794b33c73fc344610e7a

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