Malicious PDF — malware analysis report

Static analysis result for SHA-256 89fbed6ef745d214…

MALICIOUS

PDF

69.5 KB Created: 2021-09-28 08:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a3e57f71f4e43f1ab25ea463a3beb8b9 SHA-1: 4662e06e4f6721122ca8a67cc964bec89a7474b5 SHA-256: 89fbed6ef745d214cd18d109411e8d30cf8e2b617b3b14df9314e34d75ef8eba
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage, suggesting it's used to redirect users to malicious sites. The presence of multiple unknown URLs further supports this, as they are likely part of the attack infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16150a0b0d08dc---29704003792.pdf In PDF document text
    • http://suriyedostlukdernegi.org/image/files/sinutevofujutupofog.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/wetizopakekekiwox.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/27209977103.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/fe466ce1b18a524496ec46460777aece/jiminaporafeli.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/rajijaravulobesefedosen.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/16335186753.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148fcfc36707---7046355999.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/suzufixanaperegekakixa.pdfIn PDF document text
    • http://rococosofa.com/files/files/sudagamadabuwad.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614dde032cc88---porapareterotumapabebol.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/80735077149.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/5726876736.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/gopifavibabesuturusomofeb.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/kobezonagorixojog.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/munoxutodaz.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/78761759044.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/52856070764.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/loroxibetovetoro.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/78057995073.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/kuxowagomizapixusofe.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/33129748303.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=android+kein+internet+trotz+wlanPDF 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_off0000b21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB21C 15200 bytes
SHA-256: dd4732be7a130685528958b334bb3d5e981b6013269c80006532e00e4fe8af48
font_01_sfnt_off0000d8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F6 10292 bytes
SHA-256: 2e24593bb72a6fc85754588596c9362684980f6ea828413b0ce0cbc7d7eb7fe8