Malicious PDF — malware analysis report

Static analysis result for SHA-256 61c5961d52f56388…

MALICIOUS

PDF

86.0 KB Created: 2021-07-18 19:31:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8b1161692e9d8ede2ed7f251841797f0 SHA-1: b5497d6508553001052c551d9c602c356aa64f87 SHA-256: 61c5961d52f5638886ec5211cd2c6c1ec376cb450b467c406a5040ef7ff95809
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. ClamAV and ML classifiers confirm its malicious nature, likely exploiting PDF vulnerabilities to redirect users to these external resources.

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://myucmas.com/userfiles/file/foruli.pdf In PDF document text
    • http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/44425367117.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3ae0d30ee---vekorofikesefedodojeda.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/47980487063.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/1tfk5m096nkq013lc60bl5kekt/8267209497.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/d4c12164339afb1b38392488d96d08a8/jojiluvaloxukukujuve.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/599cb2b39fa481ae6abe1045687625cc/palidat.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/35675045941.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/sugapawivijajuxuludan.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bce4b2dd8---99285425369.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/8235391062.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a424a77514---muzimedi.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/ksr80bjoluqrrpcfrc64s8lthe/88911062208.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/93d3674ecea3781b7af68cec89852527/87504649051.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/6698a17c5e94ebef78b0f546778d84db/zezagapawedixotug.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/58347577256.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/77642790175.pdfIn PDF document text
    • https://immobilgold.com/file/japadarekenajoxapogumibiv.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b00593220---wolugamexinatulora.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/sorexor.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/bf20951ff7e5718cfd5581910b787e23/sedilasutorir.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a215bb2564d---20247076997.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/tukinujuwofezupoponatitiw.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/biwopuvitobelokonosuje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=verbal+questions+examples+with+answersPDF 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_off0000ec06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC06 11060 bytes
SHA-256: 3247cbdc20820cc14c64d102a775212db680387956027cf8001055bcc632ee93
font_01_sfnt_off0001056b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056B 17392 bytes
SHA-256: eceaf9199840d80642f135f677326417b4ebdf24d314a110ebe916138acd53a4
font_02_sfnt_off0001327d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1327D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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