Malicious PDF — malware analysis report

Static analysis result for SHA-256 d789346bee1c1828…

MALICIOUS

PDF

81.3 KB Created: 2021-09-09 09:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4fde47b4db28f295d959b8e934109a93 SHA-1: d9264bb77a47da66c0e247c92e7f45e9357a19fc SHA-256: d789346bee1c182820bd477e99584b067dbe5ba673c3dc567b731eefdac42f64
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. ClamAV and ML classifiers strongly indicate this PDF is a phishing or trojan delivery mechanism. The presence of embedded URLs and the 'link farm' heuristics suggest the primary goal is to direct users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://stolizstekla.ru/userfiles/file/63085070824.pdf In PDF document text
    • http://ankaraeksioglu.com/resimler/files/69561658628.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/dututemidinuto.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/tijefajupitokepamipu.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/bilib.pdfIn PDF document text
    • http://study4student.com/cache/fck_files/file/rokivadez.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/71576727704.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/rasimopibaxuxukeniranigip.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/202193353466678.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210902090407.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/68081067887.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/texemibatimufes.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/6723059909.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/sekufigonixuzomoja.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/nesejirajixo.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613695b6cdab5---bukuvogu.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31195999887.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/javalutexurus.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/80748143791.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/d0b9e20e989771577c4e457de4e8d1eb/55020310558.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/cfea154d8a180390871855773423546f/juxudabunuvawonujenu.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/pefopilivojaved.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/me7hb0ca1h6qntja0lbro0k4t0/rogatevemixusozofudoremal.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210908_0779A693D4BF697D.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=best+android+home+screens+2020PDF 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_off0000d97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97B 17484 bytes
SHA-256: 92272d17354bf53a890f0350f8578ab386e4762e47386b26c764cceadea63f67
font_01_sfnt_off000106e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E2 10884 bytes
SHA-256: 95f70a587c8511a594154cff7c0eb97b056e9d579a4f98e26163a38f9f24b868
font_02_sfnt_off00011ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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