Malicious PDF — malware analysis report

Static analysis result for SHA-256 53f470a206efc59d…

MALICIOUS

PDF

81.1 KB Created: 2021-09-05 20:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6c5f313979fbac2c2df40fbdca80b6fd SHA-1: 4b3224e906da49c159905a6caedc6b982cc73902 SHA-256: 53f470a206efc59db9406114e0f8d462efddb7edf86ab57144225447ff677a79
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing or trojan. The presence of numerous external links suggests the primary purpose is to redirect the user to a malicious site, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://wastran.ru/uplcv?utm_term=uluslararas%C4%B1+%C3%B6zel+hukuk+pdf PDF link annotation
    • https://gastrotest.co/ckfinder/userfiles/files/midupodu.pdfIn PDF document text
    • https://businesslife.com/content/file/xukesikiridabugusizum.pdfIn PDF document text
    • http://wchs67.com/clients/f/fd/fd50fd9748f3592dabdfdad26f378f15/File/80099002478.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/wejaxobeno.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/1mufn1ejilen6mlid7tbr09r91/merugavememelusotadumev.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/50654848613.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160afcfaae4d79---53360648629.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/23189831736.pdfIn PDF document text
    • http://twilaw.com/files/files/zoranukusekobisak.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/gaxivivewumoduwikek.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/67448649223.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a21e56f5a---92391055955.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c658710f4c---jemabenuxexoka.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/009d3dc8be7876ea4d5a6f273c9e668c/40149535525.pdfIn PDF document text
    • http://zonwering-belgie.be/ckfinder/userfiles/files/nuvomivopanunaj.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/66862740676.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/61386787670.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/96860590285.pdfIn PDF document text
    • https://ikansambel.com/contents//files/99745721750.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/kufawukuxo.pdfIn PDF document text
    • http://beijingbeat.com/contents//files/25566465939.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/lclv5fu3l0ibk91kk1abnqov91/11970217811.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/kiduxiparapugov.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC90 16212 bytes
SHA-256: f910c18e528367efa70e63676e26b9757334916eea0ddb6b13ca83bcd9e178bd
font_01_sfnt_off00010455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10455 10700 bytes
SHA-256: 86adbf17ad12da02422c5d4b214dd15d0f1d03095f8212b1f4ad851682325cf3
font_02_sfnt_off00011cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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