Malicious PDF — malware analysis report

Static analysis result for SHA-256 175fef87277dfd1e…

MALICIOUS

PDF

86.2 KB Created: 2021-08-13 20:53:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 76658e59ca3c86dee1b92720f81259c0 SHA-1: 69a90363d46c28c472edbe7ced3ce1784f633227 SHA-256: 175fef87277dfd1e2c57f65128ec7093ae6d0a1879db85488c3e436f8f5d4a2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to obscure the ultimate destination. Heuristics confirm the presence of a link farm on disposable hosting and compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/37aee46f5ca4ddace247aa6fb4e827ed/zipibenazenojav.pdf In PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160904051cd4f2---5495619069.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16075575185651---gederimekumomer.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/266e483f9e5ebbf6230f56d5552fac74/vojetulep.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/rufuseruxepubuk.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/85416202158.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/mibonemarapekolalivegila.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/m9ndcophrp98mkt3p78jv0irp3/4713580294.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/lifimifajo.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/depew.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c51e1f9c4a3---14629900540.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/62685268053.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/6605a0608f94a0f408990fb89f45d828/76793223064.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/3c0dd28f2c1b7eedd39bebb46e6b6602/88562883244.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/zosupuvuropezosabegoz.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/taletiruzilalevepoponax.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/retigotesenodatovigenexo.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/61124680469.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160793572526d2---48877141772.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210715_8BC23C0846EEE998.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/jevoselugome.pdfIn PDF document text
    • https://mfdesign.hu/files/file/zawemo.pdfIn PDF document text
    • https://edinburghpools.com/contents//files/gived.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/epoovj5kqkeptiqe5a4hkm9vv5/14350959196.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=ejercicios+de+laberintos+para+ni%C3%B1os+de+primaria+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_off0000e957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE957 11240 bytes
SHA-256: e4ddafb5e063bcca4cc8f4a23fc1c1124f8c42147718b416ef09d3ef9226cee0
font_01_sfnt_off0001031c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2E 17808 bytes
SHA-256: d51075fb7f69814a4ec612b927ee0b5f3a71dbe2c332434cd1a0874af6ea787a