Malicious PDF — malware analysis report

Static analysis result for SHA-256 77ea5c73749a5f6e…

MALICIOUS

PDF

74.5 KB Created: 2021-09-03 04:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9a2ca1e385755cb87efb98f8a4ef4836 SHA-1: dd2e955e5a86996f66ff787eddf78e882b48370f SHA-256: 77ea5c73749a5f6e0c09e91a0a83e480ea4fcb3801832675d3a476934bd3822e
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is used for malicious redirection or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://www.urbanwaterways.info/files/57135490429.pdf In PDF document text
    • http://www.sainteuphrasia.com/www/js/ckfinder/userfiles/files/kagimopumevatefutuxu.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/63391862412.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ddcf4d6f8---36936659702.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16096980a86c7a---47960877067.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839d114d51e---55300732017.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/bd66ae00861a2e1938e090bda113f5a2/fabarikekegezemik.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-8-13/20210813014818478831.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cd16f1f64---vemejuxopafonisunujes.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/84782989061.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/3162a70b15e712e336fdff069395bc31/6952858986.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/f304a283aa3355a22f1ecca05a131a55/ditulodivekivavagoz.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/80365444454.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/lerulexetotulo.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/xurofewokolugeverofeveg.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/9639018474.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/vazidegote.pdfIn PDF document text
    • http://sherylrobphotos.com/clients/56056/File/vawedejofilemowarefovel.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/76129091065.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/mufedaperadusonuge.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/nabusuruta.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/91c2o9mbra49p76kp5g705o007/kuvatejitufosibadi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=dividing+whole+numbers+to+get+a+decimal+worksheetPDF 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_off0000be6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE6E 11304 bytes
SHA-256: 1b86ef993449b64bc2d04aa13dd9d1b396a4c2266ced4ca0fab167e6a2eacc04
font_01_sfnt_off0000d89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89F 17040 bytes
SHA-256: ab3368cdb62b5df878f0402122152d6906b032bab3b239fae7c3c04047a1fb52
font_02_sfnt_off00010402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10402 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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