Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebb2c6d07f47a22c…

MALICIOUS

PDF

75.7 KB Created: 2021-09-28 22:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8ad2491468e7c6109da27e50fcfa5973 SHA-1: b143ac0e00443091707619278a6df333ae78e482 SHA-256: ebb2c6d07f47a22c2a31bc743162cb179cc7f7f9e0c8a1d70c85a0e9c43ac993
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://krisoc.ru/uplcv?utm_term=hunting+simulator+4x4+hile+indir PDF link annotation
    • http://mtecommerce.it/public/news/file/91143076952.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/77498631303.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/nixexoralu.pdfIn PDF document text
    • http://tsuiteru66.com/userfiles/file/gupuridafedi.pdfIn PDF document text
    • http://baove24h.info/upload/files/wurezogivujevagekamemuj.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/09/22/mugepemewobasatetafovab.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/5777995434.pdfIn PDF document text
    • http://upakuika.com/img/file/dinaxodivumuvuniwigu.pdfIn PDF document text
    • https://durimawar.com/contents/files/gadikadoral.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/956580d3d5f7ce37fced89a9be8df2bd/rejubotozobagiwuxubobufe.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/68932701535.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/wuwolibuwivewakoj.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/rusosabudonenedavadaxu.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/56266b968d38bb10dd5af364d753ea0b/finigolekobasetalosopo.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/29874103407.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/luwirenorupide.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/benelawibomakodavaku.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/tulodupokak.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614b8fc7cff04---10113448865.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/18076960276.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/zixedejalesogofosobobov.pdfIn PDF document text
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/85290107198.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000ad9d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xAD9D 18152 bytes
SHA-256: 7f28abf065764a469b6f4d2a33f2013a5c15dc91f490cf345ea45adda156a49a
font_01_sfnt_off0000c9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20C 10964 bytes
SHA-256: 517dfcbb711605ba72192747bfeaffd4ff26cbfa6b80fe0eaa89bd4933395298
font_03_sfnt_off0000fb15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB15 14944 bytes
SHA-256: 1fb1dbd7ed6b1eb78e8581b37726bb52c0ad4fe9fdc5734b10924ab2a99007ac

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