Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b13f37a091b83a5…

MALICIOUS

PDF

97.9 KB Created: 2021-07-03 21:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c81fe6269ad5f6e4e8a972026bbfd9c5 SHA-1: 15bb1b3fdd70dc2e7cdeb94a7209b492688070bb SHA-256: 9b13f37a091b83a511143547ef4430ed0500efcaf5cb2b633c3c17468079f3ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://oniceh.ru/uplcv?utm_term=free+animated+ppt+template PDF link annotation
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/psneaqhe05tkfbqb8a14ls7h0i/13840603563.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/siravewebojusukoda.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608be6b4ad623---37979669051.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/texobiwusanuzajun.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/5154097698.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210610_111018.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/61822477268.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d066abd0761---11549856342.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/444f0c11997aca9392365b3075ad5f9d/62323805223.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/03e30f618dab4d8d8d8ca21bce8b0116/79948937286.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/bexetipibiladateni.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607011900c771---76642344858.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce321b43c8---lotoseboxerosisurinam.pdfIn PDF document text
    • https://abeess.com/userfiles/file/kapuzasebudivijavadawu.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b337aedb11---xaxupofiporaxom.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/23f09e25f84b21e50cc260d14e79504c/lizisojidotedefixufo.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/54510227989.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e4f01ce21---rikojemudo.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/larekowajagebazuz.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099211126f64---15459139275.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736a4580f1f---8527168286.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/2f2cfbc7cc2c22bc304f25412621a0f1/67565895243.pdfIn 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://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_off00011d54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13566 17256 bytes
SHA-256: 8177badf897928513ddc666f481adf7e91de1153064935d275c877878bd61db6
font_02_sfnt_off00016229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16229 10240 bytes
SHA-256: f349a3109452ebc579a32979e5dfa5779751545d614048864aad7abc6f5b1cca

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