Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb1a593c630d2deb…

MALICIOUS

PDF

70.0 KB Created: 2021-05-14 22:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 751b31ee17e9eb67db3627050a2406b6 SHA-1: f3e42a4dc020c1675c3108a119139e5de9e85f8d SHA-256: fb1a593c630d2deb491648e2b13f2a2133041d901886e539fa0a7dc6fa9c22e9
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous URLs pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. The document body's deceptive title, "Dream girl song video", is likely a lure to encourage clicks on these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/7f58dc52dddab75d5c4c47e1a66b08c6/10257506501.pdf In PDF document text
    • https://mytopics.it/uploads/file/berobobuwewirok.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f395ad94b---basak.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16070ba8db94f8---60611497663.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/a6b01eb44504b1d43771ad15d7732f12/fasawamifizefapolu.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/k7i4f3kf001pr4b9ebcgftese0/wukifuxazi.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/79534195860.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/165j0gf9so1m479nic36i6v3qp/doreditot.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/5e1e09623f176b7814ff8978f2db5a22/jiwip.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/aae4d4bab2d85bebc643d8bd37d6c3e7/nitowavibirovobu.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/vakufimej.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdc2e25111---vebufowo.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c4d04a335---wiwisezatob.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/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=dream+girl+song+videoPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58D 5204 bytes
SHA-256: 1f456b6555daf84b275b69e587c1bc294549f17346b51a19450428fcc4d0cca6
font_01_sfnt_off0000e733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE733 10712 bytes
SHA-256: eec529303dd2f0e457328286f7876bf4df39045259d855b137581f76ce705481

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