Malicious PDF — malware analysis report

Static analysis result for SHA-256 e821a82784b0dd30…

MALICIOUS

PDF

81.7 KB Created: 2021-09-15 20:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 46c24e55da33320c67806d58dc401e55 SHA-1: 2e99f25872edce3b17d56a367ca5da9d0a47135e SHA-256: e821a82784b0dd3076d4dd4a7b4ddc342aadfb14020f4fa8e22916bf7273d74e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The primary attack pattern involves luring users through deceptive links, potentially leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://searchkar.com/ci/userfiles/files/54441770455.pdf In PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/zipozixijamor.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/gozikifoje.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/56480634843.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/munumesiweganitipojupu.pdfIn PDF document text
    • https://stancijanegrin.com/userfiles/file/85563411735.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/84408349664.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c467b36e9e---12909808403.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/61462425061.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140437cb1dc0---wimaguk.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140024e999d5---zevazisevojilefetu.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3dfa61280---fikorukapak.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/sunatasog.pdfIn PDF document text
    • http://irollee.com/userfiles/file/59482858256.pdfIn PDF document text
    • https://somos.co/dleyes/admin/fotos/file/95610023140.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/62636679151.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/89717977749.pdfIn PDF document text
    • https://akemi.ro/hirek/file/98240442999.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/daviputaz.pdfIn PDF document text
    • http://dgelc.com/userfiles/file/20210912125714.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/96353613345.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210906184915_1830385616.pdfIn PDF document text
    • http://contua.org/userfiles/file/fosan.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613488069f983---12845364079.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/30860368168.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=android+gadget+vcom+driver+free+downloadPDF 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_off0000dd96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD96 10784 bytes
SHA-256: e59ab7ef36c592e9df352c6d508e853f08ea3f7fc218ad0ab09b5e5e143db852
font_01_sfnt_off0000f645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF645 16868 bytes
SHA-256: 95c0d82c41db74e3f7cef6b59c262d19fa0b6d3ca436921b1d19b8ab0ba823e0
font_02_sfnt_off0001214d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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