Malicious PDF — malware analysis report

Static analysis result for SHA-256 b996b083ec1979e1…

MALICIOUS

PDF

77.8 KB Created: 2021-06-10 00:42:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 9f7e71fc4c77b5b8ed844b97e850ef8c SHA-1: a05b5bd4b870ed7fa091a153557bbcfba2f4d56b SHA-256: b996b083ec1979e1b3d6d88a07bc1793cd0676e69b8989879db897d15b45d6d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to compromised websites, including WordPress upload directories, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the embedded URLs and heuristic firings point to a common PDF-based phishing or downloader scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://pixomot.ru/uplcv?utm_term=elements+and+symbols+worksheet+answers PDF link annotation
    • http://alliance-ltd.com/userfiles/takufarozazixidujikup.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/22095698058.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/ca3ab5c5cb6c86f2898735a376f55787/wixagewofunututikelabob.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa4cab0d95---sefitetirasevulas.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/7331feb22d402e211c95ae48b55ea926/62217943236.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/vosenufeponibolifomuj.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/65739087598.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/b5a1ee50e64584be6c8d66bb7471e8ec/jameguwemenonukeri.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/20970033026.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f86c03cbbd1838d8ea465b2173735eda/rofusomur.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/65680552229.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/e5806c03fd03f0455e62eeb96be59829/kitobexuzipozudasojo.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec96e4c7e5---nujogike.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094639a54a2f---29240873131.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef351b1c8e---82841234739.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e86f0f84c---navinisuluvorulepajezus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38C 5420 bytes
SHA-256: a2452923c12c425d4c8085cbe67f7cdc8d445e3303bac2739b3eb0887c4b2422
font_01_sfnt_off000105df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DF 10688 bytes
SHA-256: 8419d96da651a47f8f237a6763fdcbf68b398bbb4ee1b9ddf73da9f4fc84b746