Malicious PDF — malware analysis report

Static analysis result for SHA-256 a976668355fe6b84…

MALICIOUS

PDF

88.9 KB Created: 2021-07-31 17:41:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 20389e41d3beb977d21b0df11bf72f1f SHA-1: db4634e65b7bdfdb69f8eae5b93f21bad3b71323 SHA-256: a976668355fe6b84259939296b407308d90dc0230d8769c3fc78fc170989c1c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to compromised websites and disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content, likely for phishing or SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8fa6ae522---pixedozawazobozof.pdf In PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/92022858312.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/70257632996.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/zavujovozidutilatebexu.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16080995c084b0---kebegib.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/defeg.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/libanota.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baca9dcd533---46531192439.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1e9b721a5---jefekuzitenizikuradugup.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16082fa8e3ce8e---23409450205.pdfIn PDF document text
    • http://scro.ru/pic/file/99357742462.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/perofopubarito.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083f960060e2---kizuv.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b47e9f1b187---kazojewo.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b9285af134d---sakebofivewome.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/73750163337.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/33471476885.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e7bf1d4e4e9---woponow.pdfIn PDF document text
    • https://baongochoa.com/upload/file/78088581058.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-5/20210505091911627952.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/14602240436.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/57487910001.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=adobe+acrobat+reader+android+crackedPDF 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_off0000f8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FE 17204 bytes
SHA-256: d97a5377ffc328dc828e572b36567130efc602651ac5edc67bf627ed10677501
font_01_sfnt_off000125db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DB 10364 bytes
SHA-256: 40bac57423074a1637040eee7c012398865c96324d7e4d2fa0b432fe569f6d03
font_02_sfnt_off00013d65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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