Malicious PDF — malware analysis report

Static analysis result for SHA-256 2084ad8be064af40…

MALICIOUS

PDF

73.2 KB Created: 2021-09-26 04:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 917da51d06417a5b6d1bf098232945b0 SHA-1: 666e8f7108c46d687c1e669de178d82bf7afb3b1 SHA-256: 2084ad8be064af403a5183eab7af40ad7038499270272b282bed63ee52266d07
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a phishing lure or a component of a link farm for SEO manipulation or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=which+operating+system+is+better+android+or+ios PDF link annotation
    • http://marcus-1.com/FileData/ckfinder/files/20210906_C0503ED4EE78722D.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/87808542092.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/4895974446.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c3e8c6d43---rewobosasusanod.pdfIn PDF document text
    • http://186086.com/upload/files/dagifazizixafuwuguxoga.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/numevubufebiwedeb.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/jevakeba.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/56129292703.pdfIn PDF document text
    • http://bdnchem.com/upload/files/fopibuso.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/43193652281.pdfIn PDF document text
    • https://adurucui.com/ckfinder/files/soxakoxonitolizu.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/sapepadamoriwavafujorune.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/92588306542.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/35679428858.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/ef91013cf28736223ffd229ed7cdfd48/bijanemisedatujox.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/75037967674.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/lanunewif.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/72415257174.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/17047032209.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/4daf734fc47aa52f2f3100dbf87cf50e/29958220430.pdfIn PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/59501500245.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/muwegoz.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/46763191596.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/92007149788.pdfIn PDF document text
    • http://martonelektro.hu/files/file/bijafasesesuzi.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_off0000b8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D7 16984 bytes
SHA-256: 308f5a5f7b528f82d84e36740c6a1e1d367ddfe2ef85fed288b3c3614f88aa23
font_01_sfnt_off0000e4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDE 11160 bytes
SHA-256: 69a55c7534450185d9561c96904a2c4702aa6c36bb4f6cd0f02fee755bbd16ca

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