Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1718017f4668f72…

MALICIOUS

PDF

78.9 KB Created: 2021-09-06 08:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9aa45401077f24a57a5b165fd0dd488d SHA-1: ab7d2f03796bd33f4147de117b8f44e32d2b6d8b SHA-256: e1718017f4668f72d8e9423b8e01ff5c1eee506ac310e6bb09fec264ca14e26b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, likely to host or distribute further malicious content. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d00c5633b7b---1652247126.pdf In PDF document text
    • http://malbreil.com/userfiles/file/99259727898.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/38592074725.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-8-19/20210819132927638752.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/zofekezasinaku.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/dedegukob.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afca1d77f20---99164217168.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/13614832021.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/kabidudozino.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c626626814---vixewa.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/06d29033cb3909c636c6c94bc7f2b344/tadujapusigosonuguru.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/sajofe.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///42981517522.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/65706095953.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/seluzikutipusepolifobagat.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/68635912024.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/89775c6e78a296a2546ea79bf302c133/19164206096.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/48729389929.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad012edd868---wotagiweposexulus.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/77301378168.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/843e6ed4cb19164bf73c10d479de49f2/89566833913.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=restless+leg+syndrome+spanish+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_off0000cee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE3 17640 bytes
SHA-256: 0a366c1bfd886b349e9b1f2a9b4c5bc6b57fc9f3cdbfb2c194c5c5e906c8f766
font_01_sfnt_off0000fc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11461 11104 bytes
SHA-256: b9685834529c65f663ac56f09b9ca7c3a2db8c0f801d71bb56f88e9562ab0389

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