Malicious PDF — malware analysis report

Static analysis result for SHA-256 d557fe23b4694d9f…

MALICIOUS

PDF

76.0 KB Created: 2021-05-30 18:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3b19c146fff1cf3594f9ed51f119ca4a SHA-1: 448625638e5d26aded853bc88b7db13b39621810 SHA-256: d557fe23b4694d9fd967438724812a39dede6c75ec10db6dc9d831f059e12dca
154 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely contains an exploit. It functions as a link farm, directing users to multiple compromised or disposable hosting sites, such as http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/kv8bedj7nougfivadcpo6jvfmb/bifevazutufikanat.pdf. This pattern suggests an attempt to distribute malware or conduct phishing by luring victims to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9147

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://gannat-ltd.com/userfiles/file/24050643724.pdf In PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607968df0149a---82833200378.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160751b3c2af5f---pubozuwaripa.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d121c53a75---sefuwavesefaxonenipojug.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/befbb320d3778e8e049544ca3c0d06d1/9880440288.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/18787060081.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816b530c7fd---73329839486.pdfIn PDF document text
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/95876312568.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/15022853979.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160792659600f3---jozasumefegemekokepiwe.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b274e6aed6---xafimidapotasalosesapudob.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/qheb74221eea6q5j34pr122jc5/gunusixelibifefabeloliguf.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/kv8bedj7nougfivadcpo6jvfmb/bifevazutufikanat.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/Om9ozkHLxGw/uplcv?utm_term=how+to+mix+killexPDF 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_off00010210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10210 4532 bytes
SHA-256: 2548d493e927c30ef252ab6fff31b15cac55423b0fe0599a1a68812336cb45ac
font_01_sfnt_off0001117d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117D 11240 bytes
SHA-256: e438c67cf57279a344f93c92a89f6fd562f5322fdf6dada421f02ba17c339277

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