Malicious PDF — malware analysis report

Static analysis result for SHA-256 e55a911caa0d1138…

MALICIOUS

PDF

66.5 KB Created: 2021-09-17 09:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9ddb07b62d478c99f435f69174146685 SHA-1: 218c05453db0fd0e0b9e724a1471a1bd0b3e1dc6 SHA-256: e55a911caa0d11389418a028f1cb32db6fed1fd477fc4567bbb60915d2f3a7ec
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9524

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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
  • 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://synfarm.com/upload/files/75215578927.pdf In PDF document text
    • http://puebloexec.com/userfiles/file/zixunapole.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/wuwul.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/75111711534.pdfIn PDF document text
    • https://orcasproje.com/userfiles/file/42253828749.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143f47b698d7---dowifejatugewobijodiji.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/feveramemewu.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614145905dcc2---ladiruwajezako.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391b99a85d2---bonulavav.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/8363621187.pdfIn PDF document text
    • http://texmet.pl/userimages/file/rewedefo.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/ee555u5hhkdq6hnu1s9c2qk4d3/zukuro.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/77751738800.pdfIn PDF document text
    • http://888chji.com/userfiles/files/76009981282.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/xuxixebu.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/wozutumolovivaser.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161325549dba5b---rogupu.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/26830146998.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/72659188112.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/sagika.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021091408064973499.pdfIn macro / runtime command snippet
    • http://aci-immobilier-douai.fr/userfiles/files/lezuxabikasapis.pdfIn PDF document text
    • http://hometextiles-conIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+put+a+tiktok+as+your+lock+screenPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD706 17636 bytes
SHA-256: c437e80a545e4e27404d3b0c51fb8be6d92bdc6a8e375868986bd0b28ad131d6

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