Malicious PDF — malware analysis report

Static analysis result for SHA-256 36e062ff6abe5804…

MALICIOUS

PDF

85.5 KB Created: 2021-09-24 05:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c37461a5b9f610b5130e575a0b912a24 SHA-1: c5cb112c14ae26c1911db6da5fbe6deec44f90ea SHA-256: 36e062ff6abe580472e5cd04d10ab69a564fd035038e374067a92be895d6710c
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to PDF files hosted on compromised WordPress sites or disposable domains. The presence of a visual download button lure and the ML classifier's high confidence score indicate a malicious intent to trick the user into downloading further malware. The embedded JavaScript likely facilitates the download or execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crewmak.ru/uplcv?utm_term=new+version+lulubox+apk+download PDF link annotation
    • https://yar-net.ru/userfiles/file/60853719346.pdfIn PDF document text
    • http://c-six.it/userfiles/files/pimogekonuvekajepatag.pdfIn PDF document text
    • https://theipbuzz.com/images/file/mavupesujizeludozo.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/13652434403.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143326c4e92f---46713926120.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/salowajozi.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/85352862663.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161478a0f95196---25470319951.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/68316332165.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/94100207673.pdfIn PDF document text
    • https://foodbiz.bdata.link/upload/files/nikinonovagisif.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/58153821313.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/26076781937.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/c62865256f719e04d0783b607e1820a7/ximalo.pdfIn PDF document text
    • https://atavio.ru/files/file/41089096390.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/81098329058.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/0bb9546b6792e3d79e956b11ccc18ca1/14164254914.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b6f050b21---26700060844.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16139b3e526bcc---mujuj.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/kedebadepo.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_off0000e4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AE 10848 bytes
SHA-256: 1bad4faeb3d551b78c090cec724feeb48f8a40bbf990013e46a56ba05d684cc9
font_01_sfnt_off0000fdb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C3 19472 bytes
SHA-256: 41ea980d1559db61c72133e8aec30db2def40c93629dbcab08cf12410d479049

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