Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a600cd61d79ed75…

MALICIOUS

PDF

113.2 KB Created: 2021-08-02 02:41:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aa2bfc11d7a8f75688d4abcd35305cd5 SHA-1: 69cd1d9e060d6db3e745beabf525995050e2ab69 SHA-256: 9a600cd61d79ed75884f17e7b77f793170189a6a6e36382224528c36d354a6c3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that displays a fake CAPTCHA to deceive users into clicking malicious links. Several heuristics indicate the document is a link farm hosted on compromised WordPress sites, suggesting an attempt to redirect users to phishing or malware download pages. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.swx.global/wp-content/plugins/super-forms/uploads/php/files/7e2f68d40645f1fd84b26fa7cd112502/96524164456.pdf In PDF document text
    • http://wamer.org/userfiles/file/12766830894.pdfIn PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210621040737.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/miradekiwozewane.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/37a092cd65e064f4a48a3d8647e84678/68434891757.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083459e7c0c1---61908306728.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16078fdeecad4f---9846182510.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/2e478a482271295f5792f0c5ae591cc6/63652449148.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/58022574772.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/gejudajitudusevulodo.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/46130114437.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/a3d676023ab33b81829a8f6d6d30aa84/72543559997.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/devepanefifaxuxad.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7902280c97---5791251028.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/46401485724.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c4dc0d8fe61---40687306428.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f0f03c006---98491291048.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/lotoreri.pdfIn PDF document text
    • http://meta-min.com/files/26069727604.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608436db82c63---48263605504.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2bb9307d3---3661933435.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=demon+slayer+rpg+2+thunder+breathing+level+requirementsPDF 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_off000136f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014f07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F07 21960 bytes
SHA-256: 63f3eaecd5ac00b25c4a83e970a9810adb49f72a48456b595630d943112be29b
font_02_sfnt_off000184f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184F6 6312 bytes
SHA-256: 6840eb303ca27881f3898dfafac7ace826219838bbb532d0f0a2ad920d791930
font_03_sfnt_off00019bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19BBA 11524 bytes
SHA-256: 8f1863c764ffcd78b5067d3a6420592a91db2043bc7bdb88348830435f0e13c6

Open this report in the interactive analyzer, or submit your own file for analysis.