Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dfe4c96fbb4343f…

MALICIOUS

PDF

74.9 KB Created: 2021-09-16 07:07:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 37c5c857ce48b70b7474da6069671010 SHA-1: 46448644c4a82e0cf76c93ed2612c06d3db97018 SHA-256: 8dfe4c96fbb4343f6155512cabbc6dbcf697c7e91c3f45e124ee2c49b61aa836
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing an embedded JavaScript stream and a link farm pointing to potentially compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading a secondary payload. The presence of embedded JavaScript suggests an attempt to execute code or redirect the user, aligning with phishing or malware delivery tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 http://ebsenglish.net/_UploadFile/Images/file/35271080363.pdf In PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/9a0c459f5fc12da252499578ad25ebe3/kopifategudag.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/posemuput.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/taresakivuwuxafotepog.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/lapiwosapidiravidobef.pdfIn PDF document text
    • http://devison-matras.ru/upload/file/27667786603.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/gowazogusavuginorikidov.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/lobipekutikon.pdfIn PDF document text
    • http://huiking.cn/uploads/file/050447243361.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/35809348928.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/90552051021.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/2680f6b7885f149788dad6fdcef6d22c/savaledigizutoxenumiri.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/69746477334.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210915220557.pdfIn PDF document text
    • http://carszana.com/image/upload/File/42138964493.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/mimiraxerugamubidukaz.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/boxawamonuno.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109082021556895.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/budizinutapijomimex.pdfIn PDF document text
    • https://sua.vn/uploads/userfiles/file/15581015804.pdfIn PDF document text
    • http://webminmax.com/userfiles/file/liwasobotedeluse.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/21482517901.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/87089528404.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/85639034811.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16135e64b46061---fijezusob.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df22677290---8743455919.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=tetris+battle+unblockedPDF 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_off0000bfcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E1 17408 bytes
SHA-256: 45607e51a15fc4f0ce72a9b71519de2721a7eafec8ea43d7740efd13a4a6cadf
font_02_sfnt_off00010536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10536 10656 bytes
SHA-256: b3dae62c64b8ccb907291906bacd3f82d658e348ec698d647f13b1ec74bb79d6

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