Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4fad563027c2eeb…

MALICIOUS

PDF

96.8 KB Created: 2021-07-08 05:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 609233e7a00622c72e1947d978fe600f SHA-1: 4ddddd17137fc2154ac6c2b1046b47139fbb180e SHA-256: e4fad563027c2eeb88bafe930893cb9546622dfdbcaa80852ab41eb3f6d8c736
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple compromised websites, directing users to download further PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing or trojan payload. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9747

Heuristics 7

  • 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.
  • 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://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/13879523857.pdf In PDF document text
    • http://train-in-japan.com/images/blog//file/39631881029.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/rkf07frht9smvp3100vl5fsdbd/topabavonogosabemap.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/25833662551.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/56a07124647ee6eea2030db6e4df4095/1844269284.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/nppjv75cn8rmrnka1b7hfer5sh/vejidane.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/68171777766.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/9dcc9073be53178947b7f4ad6d25891d/fureweji.pdfIn PDF document text
    • http://titusrelay.com/clients/e/ef/ef304ccc03541e9e6382bef5f13b0a7d/File/46434778530.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efa3601d2a---98450816411.pdfIn PDF document text
    • https://limsurempat.com/contents//files/pujemumexazipojolotumu.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/0dce60cc9d6cfa2b9480d39d5d88e932/53201213764.pdfIn PDF document text
    • http://amdind.com/userfiles/file/23694361128.pdfIn PDF document text
    • https://mfdesign.hu/files/file/jutudopodiginuziwowanufa.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855cbd29902---88317521610.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/datulilafajikazimirinimed.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/72525117498.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d60accb8a9---43079301648.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/bejivowazeka.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f0efb874f---29007275572.pdfIn PDF document text
    • https://transit-connection.com/userfiles/files/51923994923.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607249008042f---lirosudu.pdfIn PDF document text
    • http://modra-skola.cz/userfiles/file/3377864498.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/6d12a3e485fc26e105852ecc945afdd1/19292322969.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16099a13418d34---makidikomot.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7e29ca97b---91904725894.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/91023371943.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+merge+pdfs+in+one+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC4 18016 bytes
SHA-256: 9b1253ae1a05794b9278162d87e097ba888f2980798b03c37315509bbcaee32f
font_01_sfnt_off00012f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2A 10712 bytes
SHA-256: 23d8c93bffff7364eb6967a2166b2fcd856239e29ba13b883e959a5ed32aa741
font_02_sfnt_off00014785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14785 16236 bytes
SHA-256: 9f9c9255c0426c77c5b13ef22f4242f4f7095bfd8ba808a20cf1712cd58ffb40
font_03_sfnt_off00015d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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