Malicious PDF — malware analysis report

Static analysis result for SHA-256 a153683a8d498806…

MALICIOUS

PDF

83.3 KB Created: 2021-09-12 09:02:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6522d1193d09318fb38d71f41ffcb465 SHA-1: 1c56304fa483399b137311838da0cb7fe97956fb SHA-256: a153683a8d4988061b636d7d98887bd1cc1f488e558e194b5c0c7332c7291d01
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which point to suspicious PDF files hosted on potentially compromised or disposable domains. The presence of JavaScript suggests an attempt to execute code, likely to redirect the user to further malicious content or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://kimansion.com/uploads/file/falosabetomosetinurazi.pdf In PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/nerofebakudivoxor.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/kuwapabafeko.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210907082716.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/161336d50ac469---3088000744.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/90064362575.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/userfiles/fichiers/4935096444.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/33428074138.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/87832600630.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/23972067089.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/tadufimiwape.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/70310851713.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f541ccac9d---95642254061.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/98085671386.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe7142e39e---71117434482.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/46258989149.pdfIn PDF document text
    • https://badrivishal.com/media/rikemebuxenevu.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/36271632732.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/10994998787.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/85808599814.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/luvebixesivaxufidokor.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/nomutopixiwuvelowanek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=citizenship+book+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_off0000ddb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB1 10612 bytes
SHA-256: 85d72149636c7b3a3716c033f33bbd67ad4ee9378d15441cff1482f659494962
font_01_sfnt_off0000f5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B4 19124 bytes
SHA-256: 50e1cea239024d921ec7bcb0e44a6ecdd99fef5df1f34d1c3c18a115798ab827
font_02_sfnt_off000127d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1