Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ca5ab015b5efdcb…

MALICIOUS

PDF

87.1 KB Created: 2021-09-09 04:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ba25ff3a3430c136a1d9b64cb42cabb4 SHA-1: ffe8f8d6b1aeeff824728986c42f62f03cfe99bd SHA-256: 8ca5ab015b5efdcb971a4ccea263bfdadc31ceb48dd72af95d15c56ea4687773
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are identified as link farms on disposable or compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the structure and URL patterns suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://friulanapanini.com/images/file/vejenakasuli.pdf In PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fd5e58f9b---27916388713.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/33658258954.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/202199743374754.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613537d22d20b---palikunotezumojoderas.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/47530856983.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210906024848.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/28201516413.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/35885542757.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/42041984898.pdfIn PDF document text
    • http://hitmet.slektenkaas.com/bilder/file/xepilo.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/dawubakoziforufi.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161364e44b9c92---jiropuvamexegafigifikewu.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/wimazumakirovosarotuf.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360e3cd8c55---lutofuxuteradunedozotu.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/kurimuxesufepumobijami.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/mudizejujixobokaw.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/86402666331.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/14761497230.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/viwive.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/muxakodira.pdfIn PDF document text
    • http://timebymtm.com/upload/files/13630260387.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/56617453834.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c6cfdf479---82119861605.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/lerefe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=best+screen+locker+app+for+androidPDF 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_off0000f071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF071 17484 bytes
SHA-256: 182651088f5e2745309a976e04c5a2531914fadca77481bc91156316ac6101f8
font_01_sfnt_off00011da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA3 10756 bytes
SHA-256: d58abc3306df3b8b9be2a4e4320972a070c44a28ac6cd5ec0b3fc61300881fd5
font_02_sfnt_off00013686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13686 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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