Malicious PDF — malware analysis report

Static analysis result for SHA-256 23237f4b7a5683e9…

MALICIOUS

PDF

89.7 KB Created: 2021-06-15 20:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ffc5ec2414b30f89993e3d399b64b21f SHA-1: d059e778b9be700dce4cf53b060f00925b3e688e SHA-256: 23237f4b7a5683e9ba6b333ec6f704e60d9f39e271d4c9ab346f96a3d1bfc058
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is a phishing or malware distribution vehicle. Although no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it is intended to facilitate the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://cructi.ru/uplcv?utm_term=oxidation+endothermic+or+exothermic PDF link annotation
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/7e7d1c36ad737265f2a2be1f954df039/tutajatip.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/9amiq1euv65o5i4lr4hl28fl3u/zafefolizibi.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf4fb00425---84006040790.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/8d14e5b35e6ea1a85cd7d56ab4cea6a4/78492295563.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/83247996363.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a2613d329ce---kugapotuzogefo.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/c26e29f0c27e4b72c7e0754e296dd7c5/manifez.pdfIn PDF document text
    • https://chp-travel.ir/data/file/33199780709.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/xowetevolepesijinabud.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160804509eab20---sujojenokukozavetop.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/74mgd0uod8dm3umr0enhv0c261/biwoba.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/aac97823dabda248f657b794a4d1529d/59527478060.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768582b0102---62546203992.pdfIn PDF document text
    • http://funperm.ru/content/file/zurusarajedefimotibagi.pdfIn PDF document text
    • https://aspirans.com/files/file/ximojenuzususegi.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c7e2038f0---rafobunujafupaxedaveba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off00010ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE9 5064 bytes
SHA-256: a2791a326a587d92b33746d5b33a5ad47e98161f15c7907cf6c945a88a14e814
font_01_sfnt_off00011bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF9 11852 bytes
SHA-256: a9a5b55bcd4e64bebc08411fef748c8f92a59e548da267658269db1d6ebb8c0e
font_02_sfnt_off00014421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14421 16188 bytes
SHA-256: 3c30073aeef70645bf6b1eb45c3870089764dd63724e27effca40afbe49eae3d

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