Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf451fd0c6624fb…

MALICIOUS

PDF

91.0 KB Created: 2021-08-02 12:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c7687a8c68e435017388a15d18839b65 SHA-1: 04972252ed4b159459b5f8c867c8f550736379e7 SHA-256: 7bf451fd0c6624fbb0b160fcf10ffc8ee011477ff303b80c46061cb9e1ccf6b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The presence of numerous unknown URLs associated with compromised CMS uploads and disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.victoriousintl.com/new/resource/files/93189748494.pdf In PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/vavowebesefufugamuf.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/2d2jneckcvnvbgtume1hgu89t7/zapigixosugenasowasujixe.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebf81464a4---72511173047.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/48454864724.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/ladagazaxurejumu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2f52cc3e86---ferula.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/8tshckmoi3kqto3i3j9k96noh2/64983456332.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/kizive.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/92874573401.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/bipekitenamanip.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/burilu.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/maboragimafunirafas.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/lubowazimukemagedigigi.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/161006d522ff3f---93221858383.pdfIn PDF document text
    • http://lhs1965.com/clients/880801/File/sovadapusobunajani.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/xavuwoko.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202106file/2021062323064970554.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/d6621db77ef3a766caac66aa2dc24c7e/66653129294.pdfIn PDF document text
    • https://bamor.org/userfiles/file/zoganaxukolulufidezov.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/duwizagepidixebuvan.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/54806805231.pdfIn PDF document text
    • http://china-zzld.com/uploadfile/file///2021071016271175.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/p02rte4qsjop2v7ejad0s66c2j/vojesu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=cu%C3%A1les+son+las+llanuras+y+mesetas+de+europaPDF 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_off0000fdfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11612 10884 bytes
SHA-256: 10de26c007e1e48a544f7e244d6ab7d742b27cabaf21e26b867b81e2ce1d4d91
font_02_sfnt_off00012eee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EEE 18408 bytes
SHA-256: e13a18468f7a78bf5948214d1cd4197d779ccdf25ece3c3a016800218a94918e

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