Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9db81c10b61c867…

MALICIOUS

PDF

81.8 KB Created: 2021-09-01 08:36:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3e43ff6435458426f55efeeb81675b52 SHA-1: 7b93ffe5e1e72a779297fe43b8f4bfc9dd42bf45 SHA-256: b9db81c10b61c86761e3c6823d48ddaf43317efae283250a8cd7c063f02659dd
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. These links are likely designed to redirect users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3105dc34d3---51141408141.pdf In PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/84210025028.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/68839250837.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/59254bf8f46effbda287fcd9abbbb818/64733024155.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/19843952337.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/d55e197b3576c627e6fa3b59587c9ac2/1629293310.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/b54da1eb2dfda38e712b2cfc5850f369/dasagapolatox.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/q2n83nato9i4ur2mjdppvp9n35/pimixe.pdfIn PDF document text
    • https://ivaco.it/file/44360865125.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/24240325437.pdfIn PDF document text
    • https://xn--faade-zra.ch/ckfinder/userfiles/files/84360355257.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/20502000693.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160afcf6f13510---kiliwafegupugaruzusepipak.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a3bc02665---nipejesejo.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/2d5b800d6f39c7a4185dd2c2ffa282fa/25352770496.pdfIn PDF document text
    • https://bursac.net/userfiles/file/kurisukanotofa.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/qhmpna3u8jf9sibr8026hq2r73/60949603170.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/43308231233.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • https://belloverde.net/emailer/file/45554026647.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/pagewiturubozunisig.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb2c4a2b3e---kikebuj.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/3ac620f80371fedacd2080766cdbc59f/lukejuxibabofaderejipolu.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/b12827509fd33cdcf1766bfe2ce3fd15/watozu.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/546c369b41adef04aa0efd2531b081aa/gawanawurelevigafovuk.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/nofudol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=mollie+b+hooverPDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6E 9872 bytes
SHA-256: dcca88a576696ff13fff8d1e4b795ef208e0bd2210251ecdcdfdf095e076e36c
font_01_sfnt_off0000f13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13D 18252 bytes
SHA-256: 47c9adc285dab3d34509e0d7e5d71ff825841b317b7a7d27dff594ac5e64628c
font_02_sfnt_off000120b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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