Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c3b4a0668a5f2a4…

MALICIOUS

PDF

61.0 KB Created: 2021-06-20 19:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 141f5b9b3af4268d3eaca3b78990f19b SHA-1: f376f1aeb202e91da0fffcfa6f5eba1977e71aec SHA-256: 4c3b4a0668a5f2a459c86060ecbec1acc06e742a6b026132e4b627cf2ccab981
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, indicating a phishing or trojan distribution attempt. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs further supports a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7146

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://medvor.ru/uplcv?utm_term=talking+battleship+instructions PDF link annotation
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/0597da64a03ff6accf9deb02480abae8/21301703237.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/276293209c891c7ca8be5508bca38b0f/96807858113.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/wivawusedefivagel.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/bao64ku47tapvj6bo2u3d2l5dn/70039899626.pdfIn PDF document text
    • https://digireg.dk/upload/mozoke.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e65c1d04b5---xazirisimak.pdfIn PDF document text
    • http://atek-ent.com/upload/file/wumujinasukepibepikiwib.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/6de79c821a9fcd84bf9121deda3ce51d/23777889194.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847f706ec54---didobipopil.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d94f49c0d---fudupogujaxap.pdfIn PDF document text
    • http://runo34.ru/attachments/file/68125262748.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/vuvanabana.pdfIn PDF document text
    • http://fondationmonetoile.org/clients/0/0e/0ecfe6182781ff486fe5156d2e85c11d/File/67788613964.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfdfee53f3---81577600618.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/zajaxutirizedezusolo.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/05a60c1e4431aa4e65889dbca1209c47/87179120395.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9366e5cd2a---7316390703.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a8447ddaa---45820395311.pdfIn PDF document text

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