Malicious PDF — malware analysis report

Static analysis result for SHA-256 58226c39f3db351f…

MALICIOUS

PDF

65.1 KB Created: 2021-05-20 09:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 45078192854455c5b25a3e1809486f40 SHA-1: cf1dd6b95297926e90c7373f4d37f33cc35f1f35 SHA-256: 58226c39f3db351fe76ab916b24bb1b3c000f5b82f9c23d357a2595d3cf66db2
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories. These links likely serve as redirects to malicious sites or directly host further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8812

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://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/abd0d1ee10240ff261cb08fc144e68a0/1324891925.pdf In PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160846464cbe04---26140910244.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4b0d7b4bd294988a9600d91df5db462b/sinisitemebo.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/e0c33071ed04f057ac7629ca4302a852/65331969868.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/28742222075.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/xawaxepeduzupezum.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/f1a1688d132b3d0dab43197b8d31badd/21359176895.pdfIn PDF document text
    • https://hgb.se/filer/file/bejebesamo.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/849c0efa519c4277a95f4c5c13a11ecb/1155851162.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8930d7890---vuraronu.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/nudag.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/fesewur.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e658eb2ece---64248990338.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/8e68c5ef41dd9aefd05608aee561c9c6/temejitivifiziwet.pdfIn PDF document text
    • https://airbays.com/userfiles/file/34058085593.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=what+books+are+in+the+diary+of+a+wimpy+kid+seriesPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF274 5660 bytes
SHA-256: 9fcc83f59769023615048d10b63d184f95375add02bd44ea8a17d4f223ab0b30

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