Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3c9d3dec8129816…

MALICIOUS

PDF

75.7 KB Created: 2021-10-02 14:07:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0ca8a50b1c31622269f2f92b008b3a92 SHA-1: bfd1a54572b99cef7761951df60c7e1ad3fe8410 SHA-256: d3c9d3dec81298169fae00429c8294b49f06c0db4eb0f26676644504766b984c
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm and a potential phishing or malicious document. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous URLs, many hosted on potentially compromised or disposable domains, supports the conclusion that this document is designed to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://prasongp.com/file_media/file_image/file/91207193547.pdf In PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161334edb4a1b2---20154870541.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/vuwijudi.pdfIn PDF document text
    • http://cabini.it/userfiles/files/fubupiz.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/wavanu.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/wamevumuxupavavoderu.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136497154713---luxonewitinogater.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/76627492468.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/juputuzoweselagakozoxuz.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/rorirovafazazil.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-19/20210919033240417820.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/pcuofsitvtkfhp468e8k1438is/6773247837.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/vugunomolupulugeg.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/32891621439.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///45210674490.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/xobudidulowekubariz.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/jevizekikunatasizakif.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/woratepelorexazu.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/soxut.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/favorasijadomavironirupe.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/97049866087.pdfIn PDF document text
    • http://penzion.sarmo.cz/Images/file/lofimezifakaxak.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021090814053265.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/99746779137.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/76674128109.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=light+chapter+of+class+10+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_off0000bf6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD786 10924 bytes
SHA-256: 0f8c0adc6178d4869a1f4b930bcc32d8b3a9a24f0855c39e1f3a39d89b4a4fce
font_02_sfnt_off0000f0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CA 18744 bytes
SHA-256: f95375c4c21adaa10e015b921dba613f688a68080b1e56caf2308a181c24b656

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