Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb00baaeb6810521…

MALICIOUS

PDF

96.4 KB Created: 2021-08-17 22:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ac5093915b5b67e7a3e1f0a209f936cd SHA-1: 8cb0c92bc2531fd8a749509e071dda5d5ae46676 SHA-256: eb00baaeb6810521b2a6c9303ee0d9a4a75edc0e481b6f46ee8e7107ed07ecd4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDFs that may leverage embedded JavaScript for obfuscated redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://eotp.info/sites/default/files/fck/file/mupeduxeroz.pdf In PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b803cb9d4---jezoranadipefakofapu.pdfIn PDF document text
    • http://nemalipics.com/zirofija.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/lopofowoxilukogapezomu.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021070406104551.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/sugarulomoximesuwapakepux.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/godomaw.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/33005089164.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160718f6ce2840---tawapuwitakalumu.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa81aa6131---88733162065.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/cbb28a37db491b5412502ef7e53279ec/3840331564.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/51183d66253727547c9b748d16831a92/pelabini.pdfIn PDF document text
    • https://ksboutlet.com/file/files/38718464858.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/26898037249.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/kepezimuga.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0da88d49f---51441538765.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/50440834593.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/xosogewulilemijeso.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/0de2d4fee8a5c4e72d878750cb044b8b/dibuzepobogasupok.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/wipodutuvajudi.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160902ef872de8---majapusezakurokakezikewo.pdfIn PDF document text
    • http://uniquestatues.com/clients/9/91/91c6e204ee4529d3b478b0717040545d/File/xaferiboxewadirakijujaj.pdfIn PDF document text
    • http://2440027.ru/upload/file/45893591461.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/11244558182.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=concrete+and+abstract+nouns+worksheet+8th+gradePDF 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_off00011217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11217 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2E 11168 bytes
SHA-256: f656c2c8970b0a0c939a235d5ba20e68159d30537d7a9ea8a5fcbe659d610f55
font_02_sfnt_off00014429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14429 17756 bytes
SHA-256: ee5b901a94515b0bcff410d5bc8915ec71deb357a64ca56b1edd66be57a01aee

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