Malicious PDF — malware analysis report

Static analysis result for SHA-256 f17a1d472f3ac5ff…

MALICIOUS

PDF

77.7 KB Created: 2021-09-08 06:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bea6564b0c2f4cd3c0e57034daf9103e SHA-1: 1eb6bfbff246ebd599205b502972e8574054e7e4 SHA-256: f17a1d472f3ac5ff615972d4429d39e29921078d761565b40c0efa29d0d970ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://runo34.ru/attachments/file/vefonijuxabiwodutawe.pdf In PDF document text
    • http://twfindia.in/userfiles/files/37723744229.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210706070224442.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/mp8t26gv2ofqbe544u5j2ufbf9n03ftm/rugiregola.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/62411139525.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/60340631007.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/a3a3bf17f9b0dd1c3d6ee8cba07e9a22/tawalagamolugowawumatijap.pdfIn PDF document text
    • http://judge1960reunion.com/clients/873273/File/40341684714.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/860b38fda157fcd7adb0d94a284da082/guzewurededirumewa.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/guh4t259hcs45fplhd8uhq7f7u/68760024687.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e7a241bd2---78420273599.pdfIn PDF document text
    • http://unsersohn.ch/images/file/86182915412.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/233dba35973a7ef99a64f476d6a986e0/81620934953.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/44bb022d1d8e04f5b1a5f47d9fb09987/lerivasaliweb.pdfIn PDF document text
    • http://daikinhbac.com/upload/files/nugelifefu.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a77e2e892b---nefelu.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/gigibapibogevoda.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021081109514759.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/86075083065.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/15213652956.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16120df19df5fb---3072507137.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/pekowevud.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/titesikifinabu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=python+guia+de+bolso+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_off0000c5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CF 11032 bytes
SHA-256: f203605363759235a5110825305c1c06b6da92ebae5d2410e86309aadbcdd4b7
font_01_sfnt_off0000defc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFC 19504 bytes
SHA-256: 4bcc4abfeb2baaf3b2d437f5eba7a468d723c75fdb4c6bc1faab4d62374c37e9
font_02_sfnt_off00011122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11122 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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