Malicious PDF — malware analysis report

Static analysis result for SHA-256 79630d1ee521f1c1…

MALICIOUS

PDF

87.9 KB Created: 2021-07-28 08:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 64348741f2c3509ad6c87bcb889bd55f SHA-1: a7809b9208f995e72a990fe6ca73c60fde3ca864 SHA-256: 79630d1ee521f1c1bca4cb0058a28b6552e1bec22d520ba430560be8a39a51e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/02bf1fe040dc977ed4a84be355bb3a6d/52884915662.pdf In PDF document text
    • http://17njl.com/userfiles/files/25529009363.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/xebobajetegu.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/87672277710.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16100313dc8703---tobovagetizufezub.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/984ec362f5792c6f8fe75cfc52273d42/sedasamazamoxix.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/reramuregegakibusazifego.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/76b94f187310c335ab9256a6e70c38cf/72380526295.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/71882936137.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/fdff4bf9c2ef7482bef00d63e46c744c/nuxepidi.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/tejuzolepupux.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/4c3ee55b871ee25422c296e231e00f79/zumuzojuvakuf.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/9571a986a64b3b22b9306cfc67450948/botorewaku.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a932737ec9---noxevuvevazum.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/xibirezezigaziwasugek.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608991dc3bc28---23362726890.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/62314448420.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8b88cb1ec---1850809241.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/b8097f7892bc82d7da84b4d9d25d4b45/16477169690.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e672564561---nepati.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082a711da102---wapikonewizoku.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/21376699276094e9b0a1241.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608180dc23d5a---vojufuvavavuxexarumix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=usmle+first+aid+2019+pdf+free+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://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_off0000eede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F0 17636 bytes
SHA-256: c5ca096221bffdcd5452a276daab7fafd02f8b748e64224c715a2f7584fb4032
font_02_sfnt_off0001355e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1355E 11212 bytes
SHA-256: 80bafb110faac227bbaed84616ae010063ec18d0be70540de33843a1c2b1cd4e

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