Malicious PDF — malware analysis report

Static analysis result for SHA-256 8395ba7264bcee53…

MALICIOUS

PDF

127.3 KB Created: 2021-05-10 19:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 00f41fca8e5fe3aad41d8f09cad48146 SHA-1: 6884115d32ce539d557ba4a22a58c2c54a6ca990 SHA-256: 8395ba7264bcee53711497d9fa6f940dfe3c64c08075acbac56b23e41cdbbfcb
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 http://strandedtattoo.net/file/17951694032.pdf In PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/ef4d468da9ce35f62d9863aceadf57c3/dirixiwapaboxasavozo.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160768fcaa2019---6172579703.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/tovigupulikemebijuxaxi.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/9c37042d90c9a4419a2a638f2194cac0/95460149375.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d42971af4b---37742062008.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083c61db2e6f---79727667009.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1aec69e48---voberoxobo.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085eb8890ee6---86800622841.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/22b24b605cdab898f8e57c457a66c5e6/befigiwa.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/djulnh111bajkch5hksiskh4c0/lepoxut.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/ghlvcjph5o15bnipo7q9hpuq0i/nuwofovidoxisi.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/9854019975.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/7e6f21bf462a5ea4db77512b896c1d2f/sukudoge.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a11a192eae---39306941092.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/mozomifemevajekobivizok.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/fifimumazikotusuxazap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=vcds+908.+1+fullPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B3AE 5252 bytes
SHA-256: f934295cc52e6e0f39aca6f3151fc98b335dd7d8b1f4df722fe42b4f7fd698fc
font_01_sfnt_off0001c5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C5B5 12716 bytes
SHA-256: a2ba894c10ab5f0563d005fe46395c33cd4a10f10d3495b9a738af4e20bbb7d0