Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d044862aea66755…

MALICIOUS

PDF

78.9 KB Created: 2021-08-03 01:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d0af1023cb428ff92291d032758e123e SHA-1: bbc1ca27478c5fa72bb032b59be67fce2b230bf9 SHA-256: 8d044862aea6675566c7db07d7d4fce90498597487c76356b81c6457265492d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or appear to be part of a link farm designed to obscure the true destination. ClamAV and ML classifiers strongly indicate malicious intent, specifically phishing. Although no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it is designed to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://studiotrusso.it/userfiles/files/88508102494.pdf In PDF document text
    • https://quaint-house.com/images/blog//file/vosuk.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/45271584805.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cea257ee180---81573830624.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/86250759896.pdfIn PDF document text
    • http://stl-hk.net/userfiles/54947401243.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/nilunugulevukexirobo.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082587a7708f---kamitogefisina.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/8f8f00a85aae058f8c179bc5834dd993/37684246751.pdfIn PDF document text
    • http://phs1961.com/clients/2/29/29da8dc1278d8f1c58a3d16208bcb4e7/File/91973867522.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/18962725796.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/77255578371.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/4805eb52d7ce29663b43e5efd38f3efa/73807328810.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/pasazorivumunepidurareka.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16100b8703935a---navowuxezizowilusigifi.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/77db5424830748e8709717262c17ccc8/renubupim.pdfIn PDF document text
    • https://petek.biz/resimler/files/40000921843.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/8634522750.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210621/file/16242571357471.pdfIn PDF document text
    • http://akademibt.com/resimler/files/19979966384.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/20516664260.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c314bebb709---69704813616.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/759def7811368f786a2f8b56791fd201/xivitinut.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fb709e80c---88759397420.pdfIn PDF document text
    • http://4bx.pl/public/file/11242744588.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=libro+de+ejercicios+ortogr%C3%A1ficos+contestadoPDF 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_off0000cdaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C6 11012 bytes
SHA-256: d57013caadeb35141dee964709bb45af1867252c208d7aa0b3e36b1839c4ea00
font_02_sfnt_off0000fede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDE 17472 bytes
SHA-256: 789aa932adf7a54b16363ad13f6056ce17087d672aa076fcba415facd823d6c0

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