Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e9f8514b30bcc1d…

MALICIOUS

PDF

84.5 KB Created: 2021-09-22 21:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b3fabb3ec9e3c496c24b33ab809ce685 SHA-1: 01e0e15f1633ce198beabebd33c18746bbec1ea7 SHA-256: 8e9f8514b30bcc1d226d385cc1899a9fb38cbc4929a9550d937cf1456566459d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for delivering malicious content. It includes numerous external URIs and links to compromised CMS upload storage, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=online+play+store+for+pc PDF link annotation
    • https://superlitefan.com/uploads/files/27184661697.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/068d66b0f3b38c8d6cde13e737e48be4/jekaxuzeferuxezepiro.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/tabojafifirukobukomok.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/10322636468.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613777b505c7c---nazisexow.pdfIn PDF document text
    • http://wsm.hk/images/files/3349047953.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/82177726265.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/73119619546.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133da1776b58---jeramaxekapem.pdfIn PDF document text
    • https://qkon.ca/images/file/74765421544.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/122e34dfd3ade89f2805ad75e9b98670/vikerowabamugoposozo.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/58171419908.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/9710061638.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/toroxafobusubad.pdfIn PDF document text
    • http://napiarsaigh.com/images/84648780960.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145d77defef2---keberufo.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/68768601383.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/867259317cbcb495daf0626ed73cea20/96091861957.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/21290346299.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/poxajun.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/fuvodarilinewuduw.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614040ed3962c---68907538269.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/xalatotuzeju.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138b8ca7a0a5---mudevonagunikuvatesinod.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE674 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE86 17760 bytes
SHA-256: 437be71b5e70125ec809c4ba0c3da19c74f418ba3c4d6cccbbfe6b1c2d6e7206
font_02_sfnt_off00012c01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C01 10612 bytes
SHA-256: 51b5cc8a73a11da6b3f6874f58bcb737c514c1fbcc2784ced527ec3b91c55264

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