Malicious PDF — malware analysis report

Static analysis result for SHA-256 213761c3c3013973…

MALICIOUS

PDF

70.7 KB Created: 2021-08-29 23:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 037742a998fdd62b26d33ead6e17083a SHA-1: 13fa5036fcbc7b5d0449b2ad583eb8596f057410 SHA-256: 213761c3c3013973ed02f836451d842f6523479f9fd090b2775c72ec9bc0bf11
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an effort to obscure the true malicious destination. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious intent, likely leading to a second-stage download or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8477

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 https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/c7a5f2bff70a42c98b4c74ca9e4bc6a0/95518834361.pdf In PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3848ae629---25801676410.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/24807546262.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/83669985145.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/4b9b37eba526729b301dce4d4b8ec2db/kaxorafamiwezoriten.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/jefetimanuziniriwama.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083a34e2871c---69636981295.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/93666311221.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d67499c9e---gikuzuxuxis.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/pubadesenojukamejipege.pdfIn PDF document text
    • https://kopari.hu/files/file/nogebaposab.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b744fac230b---6208802581.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/gunaretat.pdfIn PDF document text
    • http://elitvorota.ru/f/file/85244785767.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/xanunojaxu.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/7146038225.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/wolarefaza.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f68887e9d2---86276258170.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/22249429989.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/fewitukarisufeni.pdfIn PDF document text
    • http://immopolignano.lu/images/71838828641.pdfIn PDF document text
    • http://bluefield1966.com/clients/26642/File/gamote.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/sojadojisekiva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=not+withholding+federal+taxesPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/zabilojuw.pdfIn PDF document text
    • 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_off0000e1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E8 18536 bytes
SHA-256: 648b3cc864c37f985d5d78546d49c7f67b5e9ae259579e9ed7688584949f9c31

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