Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1eaee0f891e04b5…

MALICIOUS

PDF

75.4 KB Created: 2021-09-16 01:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5234034c9b5af1a9989008c73001bf3e SHA-1: 587b2ee38388de00b011940303f96a675c76508c SHA-256: f1eaee0f891e04b5dd14be853287e4797bd456bb91d926213d1d573698f4f7ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress installations, suggesting a link farm designed to redirect users to 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 structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409282195aa---pusawodimoxokoze.pdf In PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/64305055650.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/worakibarowarolekifinat.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/5472129029.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/ginov.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/68122463271.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16131acf28fe83---nokezogotisekedoronuwudu.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/torovi.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/21384161886.pdfIn PDF document text
    • http://dkind.net/userData/board/file/gomove.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/569a04f59813e547b8e42dc1f34beb4f/60506120293.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/bovimokaxagafosojoxudoguw.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/sikirojekumalijam.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/66454147543.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/95188678645.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/vupikomuturifexaf.pdfIn PDF document text
    • https://ccskin.com/geektic/files/50965233416.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409b2f71195---vasute.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/zaxowo.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/21823773115.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/21683041285.pdfIn PDF document text
    • https://bepcongnghiepphuchung.vn/userfiles/file/zujusaseketikinabunefeba.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/39403490692.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/jemepalenimumogugoxut.pdfIn PDF document text
    • http://dytac.hk/userfiles/dakowizamusodosasibinalem.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/mexadomilexavirizovexud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=class+7+home+science+book+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_off0000bdbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDBF 11000 bytes
SHA-256: 60a514b914aaa8f8abfe620a28278519175e836184bcbbd6d1baf0cdeab5624a
font_01_sfnt_off0000d6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E3 18648 bytes
SHA-256: ecf8da82788d4c49a93bb5fd1a3ea2cd0b7899e450c056ae81f857e59ad441ad
font_02_sfnt_off000107ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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