Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d494ff145416ff1…

MALICIOUS

PDF

62.3 KB Created: 2021-09-04 23:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fab9b56b736547e651c5b31c366a6dda SHA-1: 26d03072296388450870e17e7ee6224154e4d36b SHA-256: 2d494ff145416ff18dd2dcc892eb78b1f38abb82130f799ec93d608f49564e4e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7215

Heuristics 5

  • 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
  • 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://slsnn.ru/content/files/61962923605.pdf In PDF document text
    • http://alexlunacoach.com/img/editor/file/gekonugigejajun.pdfIn PDF document text
    • http://poorclarescork.ie/images/gopaw.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743b9450a4f---zopidowezedonodekut.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/96f76a51f4c764ea43d6303e6e8808d3/61451023154.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/37282281121.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/safasefuvovipamejiguneva.pdfIn PDF document text
    • http://boisehighclassof1965.com/clients/879780/File/nidafiwi.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b22fabd9b99---totokebof.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/7tkd1mmk2cdmbi511uu9uliumo/gowokejonidaladiwex.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/vemoko.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/63215291669.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/jibubotuxajitowu.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/bopetelesebobakexojuxunu.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/fomifaloxadukenutironodi.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/61590370140.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a934443108e---wevoxasolumakemerabazosow.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/55592384558.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/39561764195.pdfIn PDF document text
    • http://fabtur.ru/upload/files/66213194510.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607239c5bf897---gifolinoxofugebasimav.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/rujerow.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/f0a70d1884db12ee770d445a9e15b05a/dawuwaxavexefad.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/wevatufawerusosavokesofo.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/46733828072.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c6264be80---99147647424.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=holt+physics+serway+faughn+textbook+pdfPDF 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_off0000c8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B9 18788 bytes
SHA-256: 11891676366390aab1ba045607c8c154c93657f1f8fcc12557187053d1423ea4