Malicious PDF — malware analysis report

Static analysis result for SHA-256 c959b9902ec4e1b3…

MALICIOUS

PDF

95.7 KB Created: 2021-09-04 22:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 188437489b830abfdc685fa57104a5a3 SHA-1: 1efcc3d47193beb1550b8fceef2ae532170bb396 SHA-256: c959b9902ec4e1b3e57dda1f59fabf7e5f3edda84fd44e2eac69355dd2f003e6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress sites, specifically targeting the formcraft plugin's file upload functionality. The presence of multiple URLs hosted on potentially compromised infrastructure suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5517

Heuristics 5

  • 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
  • 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://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2c4f11a09---91476577190.pdf In PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/7c1a19e2245d166ffe01e1b87e15f0cc/tezimuwovibowepinegeza.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610ebbd19bc72---60700978881.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a61f7a1a469---70763772913.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/icbvaff3u1a3svcmic0j2sel92/92140386545.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/1229f1460a7626a2698bbd7a4e71808b/kafuxugawujitezemususi.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098217040e31---kozuwutolojedezufo.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/xomuvivodusireg.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/gonazipubege.pdfIn PDF document text
    • https://2acontractor.it/images/file/rudizagagebisebumuvuxisid.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/88492412202.pdfIn PDF document text
    • http://bookblog.kr/data/file//files/41016736435.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/e9995688f787e15a40f3d22d62eef403/lejopefaguw.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/2eb89aac4d2941e1c6108ec289619f53/xigepuneja.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/gosaniju.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d527f8438c1---tegifopenulirujokeb.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d5fa0abe5---mejip.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1608433ad882dd---54600780467.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/xelumejiriv.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830ce5b3fb1---30859380733.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/24862147109.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160c0eff8a96fb---81134761417.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862c7534397---51139432101.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/68222353354.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=2009+nissan+murano+owners+manual+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_off0001521e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1521E 11060 bytes
SHA-256: b481633757a130b80ac32214b4e436f75492597423bc22fed4389832b2b67a78