Malicious PDF — malware analysis report

Static analysis result for SHA-256 f84af832f2755f45…

MALICIOUS

PDF

69.8 KB Created: 2021-06-19 08:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 22036a66f5f2f8d10b722b0003684d4c SHA-1: 451c4898e44a608785b1911407ad98bc3d38a284 SHA-256: f84af832f2755f45696791d13735983b2b0662b4c675481985c0c09d55b675dc
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to various domains, many of which appear to be compromised WordPress sites used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://atreve.eu/ubezpiecz/obrazy/file/wajojugadogulur.pdf In PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16077aa4fcc260---zitevumonibefoxizof.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/0aaca6edebfe81eb1069f6fe32a28f72/zijoxiravijonetaxafobi.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c594f3bdd0d---xosobuwi.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/33415233437.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/5014508093.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/b31182ea9f62e736d5ced3c90c21881f/labifotutufizowekejexegi.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/16165351934.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/nezomebedakilub.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/909f082d4725cbecd3ed3f6cbef680c4/lelujafudedunigap.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160c04ab5bcca9---bofadelufijovizise.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749ec6d5cca---27659495232.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16098c9af63ba4---71004111283.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd20ea2e47---44765727711.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/YTWXjIUwRh0/uplcv?utm_term=rs+aggarwal+class+10+chapter+1+pdf+downloadPDF 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
    • 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_off0000bcd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD8 5708 bytes
SHA-256: a55bef1fc74b470656840f9bff63fc0df4983d0c63634aa4014d24a4fe63a356
font_01_sfnt_off0000d05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD05D 10624 bytes
SHA-256: 529532b3560d6c22f42032f98abf5b9c86153de6132a196da117f07e9fad1530
font_02_sfnt_off0000f4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CA 16212 bytes
SHA-256: d4e3aa0e9b7fd90fcf98723dcdbcb2b8cb511dc5596033a81a479200e7386e76