Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b9af4618a61e18a…

MALICIOUS

PDF

83.5 KB Created: 2021-08-24 01:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 05b90f5dc4f13cdad04631c3f11d1251 SHA-1: d96659a5cbc8d9470bc40bda330333a12bffa1a9 SHA-256: 9b9af4618a61e18ac9c4d6cf746fffcde4d534927263192a8b3e657899d60049
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. Several heuristics indicate the presence of link farms pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malware or phishing content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/cdcc89f519ff2547f14249aa1749ae4a/ravokuda.pdf In PDF document text
    • https://cissud.eu/uploads/ck_editor/files/60072322653.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/va1v52j6246fjtan18mdn12r62/wujowupizilazozike.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/25789692951.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/8fp8fvomfnoa0teh6hei4vn556/76275786679.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/ac3a209f5730390aa875333b0933bf11/9720782509.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/db3399c6a8c255bd066fd54ae4b1f0ab/nebidonotar.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/verisepet.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607197f4ea377---xakifalefipusim.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/93430154227.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/40817538060.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/2cfefa87ed3a4a83b92f41d271bb5f1e/wanogijaxetidapuvo.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/i5mj4s9ta5adkoreinaeoremt4/64765566883.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/30fc93de0d65991f6c8df70ce84ab347/xidupovajadusisubedubo.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/81453469073.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/99846442157.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160cff1a16f247---zovasosobivisi.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/59462670215.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160828fdc05495---23382466181.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/gesodapilato.pdfIn PDF document text
    • http://hevolta.com/upload/file/87012067962.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/9b17c4853c9aff86bd4aaf1dd7568550/22095351746.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/71517237339.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/33001872371.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/14617748921.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/30959171395.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=download+kms+activator+office+2016+portablePDF 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_off0000e0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B0 11628 bytes
SHA-256: c17f608b7139a6ba5ba808062e71ba7ef0bfc03302a4086687654a41b9036ede
font_01_sfnt_off0000fc42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11454 16848 bytes
SHA-256: 0a0a0718d8317f16576b054002575c23f3d7fefaf3b32a65c0c24c58e3166bfa

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