Malicious PDF — malware analysis report

Static analysis result for SHA-256 e862577696a9d1da…

MALICIOUS

PDF

105.0 KB Created: 2021-06-26 17:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 73867e4a940cf47579a9add94165e9d7 SHA-1: 71086f28a84e78d2d6236111e32c8b6deb75b86f SHA-256: e862577696a9d1da9144bbb5d252cd48319ed0269999a41c57ae340294e648f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 6

  • 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.
  • 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://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d65550404---1802054537.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/e8eh6m68c1751ncfr61mco3n8j/kuvaxogomexomugopavozebo.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609f796b5b65f---jakike.pdf
    • https://lesfeesdelhetre.fr/upload/files/wapamefosifuwe.pdf
    • http://saovietgroup.com/upload/FCK/file/95319065755.pdf
    • http://studiolegaletrotta.eu/userfiles/files/gosulanasinaf.pdf
    • http://ajivikafinance.com/userfiles/file/fasameg.pdf
    • http://tradeweb.es/userfiles/file/82017056845.pdf
    • http://mg001.cn/upload_fck/file/2021-5-8/20210508163004537641.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/3tu37no59kmch06dgbe94ke1q7/rapevagotorafuvewed.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/eefj2nkuo8v9nt01ak7bs6dsr1/72853447122.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/0a32rhhbp12o08ukbq9mr5sk21/44429812746.pdf
    • https://ludifrance.fr/userfiles/file/wedaduxeseperatas.pdf
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lozijifugurazegimafex.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/8e5ff66efd9981358ed1e5db748f7e0f/tetarejisaxibi.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/lujinugitupokogofimed.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a761a223321---28468744988.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb76a30e3d---bawotuzusoxekepatotifu.pdf
    • https://bdsvieclam.com/upload/files/24371283981.pdf
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/10847036668.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/mane8ajhmnhp6gtrigmnftb0f2/15870756485.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2aeef5e507---31691322859.pdf
    • http://limoride.net/gallery/file/gonatupanavitu.pdf
    • https://hometestbanks.com/
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=structural+analysis+5th+edition+solution
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000115c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x115C1 16792 bytes
font_01_sfnt_off00012dd3.bin
0323bc85d6a2bedf9a1c32b3d22177faa4d2a60578c8f044c7924c9a2908e364
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD3 22216 bytes
font_02_sfnt_off000167b8.bin
450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
pdf-font-stream PDF embedded font (sfnt) at offset 0x167B8 16088 bytes
font_03_sfnt_off00017cee.bin
45b82629fc281116c952c434f5070b7dcfd04574a56a2c147cecf6bcedddc28c
pdf-font-stream PDF embedded font (sfnt) at offset 0x17CEE 10892 bytes