Malicious PDF — malware analysis report

Static analysis result for SHA-256 e97466f6b2d08d20…

MALICIOUS

PDF

76.7 KB Created: 2021-09-07 17:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 573a9237547e5a490638f53e756a5e28 SHA-1: c66416c7656cde2edf6c5214c9907338f3ad3928 SHA-256: e97466f6b2d08d209334b23394776d0418d565ecffd4ce100dde926b428a6f5b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites hosting other PDF files. These secondary PDFs are likely part of a phishing or malware distribution chain, aiming to lure users into downloading further malicious content or revealing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a510b771d13---fazotafusodisexuna.pdf In PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944c108731c---32452598507.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7ec4eb9fd5---ragilogazetediteki.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/36006758053.pdfIn PDF document text
    • https://sanxuattrucauthangkinh.com/Images_upload/files/zelivurimi.pdfIn PDF document text
    • https://invest.pl/userfiles/file/46896961345.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210623_211054.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/76120748579.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9963a8dd9---fawekomuw.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/63290871414.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/36580677326.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/c0df13d3550e4563c2f9f6e2056b68db/jixiroduvegosexuzubapalus.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/bsftbd99gvatm99lolhpo0mtb0/wuxosawominadomewiz.pdfIn PDF document text
    • http://artside.org/data/temp/file/67885544152.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a2feed4324---farirok.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/fakasov.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f24246cf8---zisorewafozagilaxefi.pdfIn PDF document text
    • http://dhs1970.com/clients/9/98/98bceae81adeaace0f0761aa7b0d12fa/File/kogesufusadivitavamewub.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089722e12dce---vininivilopewekibozef.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/99103031004.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/68463169646.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/f020e23497fe0384a7ea225aa577d35e/xoseja.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202108191104348907.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/jazotugureso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=timer+temporizador+digital+manualPDF 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_off0000c7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C2 17596 bytes
SHA-256: 859aa06bb31039e27c5abb247c772bd8d5f8040c245eeb747beda9a4e5ae7c5e
font_01_sfnt_off0000f4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E8 10688 bytes
SHA-256: 93796402cf72f3ff78843d1038398f8f9d1b578089adbaad427e6cd595e769c7
font_02_sfnt_off00010d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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