Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b379a566997b43f…

MALICIOUS

PDF

88.3 KB Created: 2021-06-27 14:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c85cf9ca76a87f92dbf87c093813fff5 SHA-1: 46ad8fa955c4ec6086a59228e51f86f2c820984f SHA-256: 6b379a566997b43f1b264ef270e81bae61e8075f403aad397d06288cc619e4e3
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to external malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://amrapalispot.com/userfiles/file/66321329225.pdf In PDF document text
    • https://afra24.com/basefile/afra24/files/76285810507.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/57457397285.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f519346756---10970935817.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/1821a33cfe860c9469a1cb41883c494d/bofibonagen.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/49697443267.pdfIn PDF document text
    • https://hostingalani.com/calisma2/files/uploads/82133258239.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/dufisab.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082fde3921ee---tezojifanixovi.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/61520644417.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name//files/18199983567.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210626221508.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/xuvevisupukojelivap.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/tf25k9j1v6l131gobrj4rf53a1/65176511288.pdfIn PDF document text
    • http://cuacongtrinh.vn/upload/files/23299902733.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6a6a7245d---lumelopukugo.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c52c0ee947f---10127732883.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/zokapeduxidonuj.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/4c926997b31c770fe15e0218fba5afe5/34040855929.pdfIn PDF document text
    • http://jestbogiem.pl/app/webroot/uploads/file/xenumujifopuk.pdfIn PDF document text
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/93191503540.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a64650cdcc8---71988326939.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/tijofasexewupopewezenine.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/429cd66866b350af6de168c40c468bd0/misedizabes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=which+is+better+liquid+or+powder+laundry+detergentPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/98a9a7fdbc666aae639f0677c5f35e46/tetap.pdfIn PDF document text
    • 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_off0000f226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF226 18088 bytes
SHA-256: 4b96db1cd8628d4872fdebdab08f45a86d6ce8e51161928c56e8f9f9e9e2e77c
font_01_sfnt_off00012145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12145 11372 bytes
SHA-256: 27b2f474a88aaaa331a52dd37a0786dd0198e6b952634a1e0e43f13cc7243e5d
font_02_sfnt_off00013b5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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