Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce36e0e9cac55406…

MALICIOUS

PDF

90.5 KB Created: 2021-09-04 23:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 29d4066ab42af9c5f19809890ab5a9c0 SHA-1: a4f6afb68ae4faf118d369c44289621c9b78dea9 SHA-256: ce36e0e9cac554069af5ce5582ef2928282fd7ce3af4c7d4c511a3b7010bd900
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://udokutscher.de/gfx/userfiles/files/folaz.pdf In PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160912bb7e6bd1---60324420425.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/76485795524.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/8378913577.pdfIn PDF document text
    • http://toyotalongbien.org/data/dulieu/files/14133909423.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/xikevetevubakaniwejog.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/rafofavopominakazosilimef.pdfIn PDF document text
    • http://normandyclassof79stl.com/clients/e/e1/e16d7b8530e96d8d426d6b963c92b0b5/File/gadaviwe.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/52de4d17887d5c7ea48f54ee067d348b/53843369777.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/kikozegunogodapogutu.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/podegoputoketaxozusubuzuf.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/20178904660.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/9553749334.pdfIn PDF document text
    • http://headrepublic.pl/images/files/jilusafemoxalalir.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/dobikorufuzufema.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/793c753b7daafff1462306dd18d73601/binalekugar.pdfIn PDF document text
    • https://primer-spb.ru/files/files/tibolebumalum.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/70028187024.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/sipomo.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/vuxikixi.pdfIn PDF document text
    • http://elitvorota.ru/f/file/tusegowalaz.pdfIn PDF document text
    • https://davaocarrental.com/images/file/20887303138.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/e61b0cf5b8ea2a4fa614763ce881df48/46660520244.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=rohs+battery+charger+manualPDF 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_off0000fd6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6F 10984 bytes
SHA-256: cca6a6367a06321f09b70cd0b2e9de8b1ded8043238b20fe347b684bacad1dfd
font_01_sfnt_off000116e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF9 17424 bytes
SHA-256: 96d6b35c8937c735be5aaff57ede0f1bf249a600265e46acf688d08afea5d534

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