Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5755ab2257fc035…

MALICIOUS

PDF

63.8 KB Created: 2021-05-08 15:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 61a2744c48738ea6aca7494e10d0946f SHA-1: 90d90a4455951d5ee8c3199330fe3ec543a3a335 SHA-256: c5755ab2257fc0354a363a26c65b55ba2d773144b636df028f3d78103c2e7ceb
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links pointing to various websites, many of which are hosted on compromised CMS upload directories. The ML classifier also flagged this PDF as malicious. The presence of a link farm suggests an attempt to manipulate search engine results or direct users to malicious content, aligning with phishing or SEO poisoning tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8977

Heuristics 4

  • 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://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/ade6a3c11dfdb74c371dec22de7fce5d/tikegojumufiw.pdf In PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/c6a15b2a7a597761581d1f00fd46f485/53732834236.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/3ac9086c71381e44b3c337869a04bd37/56948998130.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607abfcad529f---27879904425.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/84dee7038b99b62f66c08fbf6893337d/rofapirizuk.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/f3e2590dad3a3fbb699d4ed6710e6039/88384957561.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740920c8eb0---kufupofu.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16082604f82fbd---69486910769.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/jh6g5oofitujrnaarde6gvsbep/87265903885.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/vekiziris.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/gui14qlpjj5ufhqo2jt1n3clof/53440090191.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/579d8b99164692e75b65f809f1b4c685/vikike.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/c730d8307e33fc2608845b2f431291e4/rediv.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/s0sdj5921rhsgr65a1ps88u581/bidowutuzopevefixo.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/7atiugl8qsujtcr20elqe94jr8/parorosovopaluwisukebilod.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606de31ed03e6---jawuwi.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/zMnd8XtcwSM/uplcv?utm_term=zygote+body+3d+modelPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD15 5024 bytes
SHA-256: ca157f2272aec26beb3786cef8e90e7cc4bde1457b41e962fc14eab62e680cde
font_01_sfnt_off0000de32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE32 10184 bytes
SHA-256: 39923d6910c037c6b189e73d94852bebb229607d8ff8c4fc9d7b498eb6819325

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