Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfdd6fd51efc367b…

MALICIOUS

PDF

70.3 KB Created: 2021-09-01 20:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 665b5ac9df909656591036a358d47eab SHA-1: 1dd79c97db70a6409a479de67815d7cdc058fe39 SHA-256: cfdd6fd51efc367bb4bbda187cba1224d9835664c183ae167c229a92c446a362
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size and image-only content, typical of a screenshot designed to hide clickable elements. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://bodegaadrover.com/userfiles//imagenes/bowufamopuwezuva.pdf In PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/40ccd7cd904f09bd136418a739b204f3/zowaluwigibobaxep.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/27701534310.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/76263672172.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/nirobuxeferul.pdfIn PDF document text
    • http://redactron.com/userfiles/file/16868412320.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af2cb8049c8---ralusajila.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/3910938890.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/rikutulesenonoker.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160715321bd574---vupobid.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16090e0e38d8a9---bitix.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/bhl0ks2df2ub8cbkmnjheosnbd/4043422541.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/e41866d29cbb8a36508168c4021ad2c2/95134096625.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/6rmnefj2novjgenq3prfp1g153/buzomakelukegivixaru.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160855768a22b2---34467126272.pdfIn PDF document text
    • https://rumputhijau.com/contents//files/zutosugolujefujibukutov.pdfIn PDF document text
    • https://thietbidienmanhcuong.com/upload/files/59810947696.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf27593e57---kirofujujugu.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/e4tiu2v8m26980dj6iitf4itf1/bizunirosaper.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b06f7b901a---jelaxuruziregedip.pdfIn PDF document text
    • http://mileschapelcme.org/clients/9/9b/9b85db73e8c1d5ae3bc18b6db4f26039/File/xuvawukudodatemub.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/piwewezulopilidetokine.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/47kv5d2uu5j0fckt85t7nl4i34/83254919569.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=the+witches+2020+torrentPDF 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_off0000b6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B0 10408 bytes
SHA-256: 3c1c71001ecd279314e4919e5206fb569a7b0c001367b5d4376ac29be6c66d3e
font_01_sfnt_off0000ce58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE58 14164 bytes
SHA-256: a9f38645f10b3580a557f7227bf2476e0b75145df8093565b6b9e2077ee7f475
font_02_sfnt_off0000f190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF190 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1