Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef8d2ddfc2b51596…

MALICIOUS

PDF

71.9 KB Created: 2021-09-01 01:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 493640b252d7b652292a3ebaad0c27d4 SHA-1: 6da27ac18ca8be664c00ea73ef54d3e6c6cdb5f0 SHA-256: ef8d2ddfc2b51596e720cb55a4c450edd19e30aa3baf2e4f0a8f1d44b00526e5
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest a tactic of using a link farm to obscure the ultimate destination and evade initial detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 6

  • 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.
  • 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://dcbestwings.com/uploads/files/72841296454.pdf In PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/20604270785.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/jitufelejaminawawi.pdfIn PDF document text
    • http://minutemen-jrotc.com/clients/84940/File/86131042985.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/jigarelisimutavele.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/a267421117b4b8e9dc0a66059f4e8d57/73071368013.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/duzudiketel.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/56585737153.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b18ae497059---totokud.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/zajasuvosamubemopepowisun.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/oov78ueau5m5j3n7flnh37s153/93999197367.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/a8a93ca654bfa18c87ce9160c9f7201a.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/48546932765.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/e3108055f8d0b38dd00e1f7b5ffd5fb3/33860163315.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/72379816811.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607907fed701d---13128985739.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/2300624065.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/58074677330.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/xudoni.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61820248432.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a7f96e108---45584438480.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/ribuzuxopekoxuseb.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4a9160b6e---pumuwuruvodadani.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/58391945012.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609edec877718---91711804783.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/gopinabivak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=diff+between+nucleus+and+nucleolusPDF 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_off0000b99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB99A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B1 10696 bytes
SHA-256: 4103d1829a624974b44046b585dcd1a43268ed10aa1d7aaae2e190d9b9848444
font_02_sfnt_off0000ea6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6D 15856 bytes
SHA-256: 3143c1aa459392260ec6d1b2286438bfdc14bd1b710fb25c9c9310a6f08d8360

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