Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bd057bb5da94c9e…

MALICIOUS

PDF

74.6 KB Created: 2021-09-05 11:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e5862f2b717d79ebec71a5b68bece93b SHA-1: cd7afb7dc571e72e1ce4f73c140a0bb82ff78825 SHA-256: 5bd057bb5da94c9e7823461c600f1653e8a698a4e0caffb6a669ccf24542efd2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination or leverage trusted domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://ronaldtan.nl/images/photo/kepuvezetidimorajesibe.pdf In PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/cmabogfk8e25godmoh4ortlbr7/demaruzevimumarozaxir.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/j81mnhd14pjebmse1tk4nj5g47/wosipukavoti.pdfIn PDF document text
    • http://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/15199667622.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081999a73871---luwosesakokud.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/jorujukodewawagazojibo.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073208ca4b7b---tejofeka.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/votuturalikovowalogaw.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/timokorufawevuwi.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/1016e4d01cbc5624febc28de1d6f4d11/38189412248.pdfIn PDF document text
    • http://m2m2design.com/userfiles/61928148616.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/gebazun.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/66773498451.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/46386551294.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/39369708604.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4b9e567ab---ronutupexino.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/29387761434.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/6970762144.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c17d0d3d35---26826251163.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/wufojukavobefezutikuremu.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120017acbeff---razewivisodofipobobiw.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/wibuxikotadotal.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/sulabudi.pdfIn PDF document text
    • http://robedecreateur.com/img/files/daxejujuvugejapuxisonima.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=preeclampsia+management+guidelines+pdfPDF 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_off0000bece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBECE 17256 bytes
SHA-256: 6621106a20fc51084dc4a3bc2774b9bda9b594a1d629925f98fcdc19b1e60c93
font_01_sfnt_off0000eb4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4E 10944 bytes
SHA-256: 1b2bd54a7fe7627c89823362e5d95710c57dfb71cc9bc0b409fd34052ef562e1
font_02_sfnt_off00010474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10474 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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