Malicious PDF — malware analysis report

Static analysis result for SHA-256 b86a154527de9ced…

MALICIOUS

PDF

84.2 KB Created: 2021-09-06 16:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dc9117a2d825427a864d28abf95eede3 SHA-1: b2e91dcaee2244f148789c1f52e566392c242d67 SHA-256: b86a154527de9ced075b5a7dbabd4a61cd678ff646de987cf3d47bb4fcba8562
156 Risk Score

Malware Insights

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

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan. The heuristics indicate it functions as a link farm, with multiple URLs pointing to potentially compromised WordPress sites. While no scripts were directly extracted, the presence of embedded URLs and the nature of the link farm suggest an intent to redirect users to malicious or phishing content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160963aea20a49---28609771122.pdf In PDF document text
    • http://selfmadefilms.nl/userfiles/files/delulituxigujegapi.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/ghvuietsmjnfksa8vs94d2k0h5/foxit.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/11968303026.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/83773328574.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/wapan.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/3c9947dad4e773a5795091525344f1ee/gozosu.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078fb3401868---20229429329.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/jogech1f4beir1p8mr78q4qu24/bixebudexizebivabe.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/93717080274.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec453a9f88---jurobuwoxoxitekesibegopek.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/janijojupinavufegasu.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/42689559107.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/29b806e814a819eaa32d923fedeac24f/sigixikinazejawali.pdfIn PDF document text
    • http://xn--l3chcucnqd9c0eua7b1k.com/user_img/files/lanibakudev.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/mokemufagobazal.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713c367cde5---12967493296.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608bea06e1c4b---3301532359.pdfIn PDF document text
    • http://www.siposferenc.hu/html/82283897009.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/bexufut.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/b90b5a40946e6b9fca74dbe59c6c5801/pituvijis.pdfIn PDF document text
    • http://cke.hk/userfiles/87738799874.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/wibex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=introduction+to+exploration+geochemistry+levinson+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_off0000e20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA23 11400 bytes
SHA-256: 5a9defc039906b38bec637f73e6519ed5a5b04886078497e99ee29d8438bc63b
font_02_sfnt_off000114ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AD 18092 bytes
SHA-256: 5b0e47a5e551254d4d7b09b7ac449cbfe4d5e5e9fa94080eb452c4fef71fea48

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