Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4cab7cda8abb6b5…

MALICIOUS

PDF

84.7 KB Created: 2021-08-25 17:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c7fda31b87ef871b99b58bbdf7478aa4 SHA-1: 467e25b7e9ae73ba8416a951f4b012e855be3cce SHA-256: f4cab7cda8abb6b534637f9fcd7ec5f1a254a7eedfdd3729cf742ec7035fda83
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing lure, utilizing a link farm hosted on compromised websites to direct users to further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to exploit users by presenting deceptive download or content links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.morrisjones.co.uk/EditorImages/file/gakijosejifodosaromel.pdf In PDF document text
    • http://bualuang101.com/backoffice/upload/files/59707173889.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/mipawazisexozexamafum.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/3oa6c1dp2p507ng40c8518digu/wavuxovunox.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/6ab22d3634c61a74c2a026de06cb5648/vedipemebenojeperulojiwo.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d2e9b5809---wexewimunexevupisir.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d28c7c3c873---4698383152.pdfIn PDF document text
    • http://abroadster.com/files/77211487073.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/2dff89b6ba149786c3d7d5ea159dd8a1/betakus.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/zobepagumol.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/53717978389.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/89976064066.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/26525783828.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3a9e8cffe---7602123519.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/58578882264.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/50480482619.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca942e6b97---talanavusimupezemu.pdfIn PDF document text
    • http://atrsara.ir/resource/files/fepil.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/wasoxitudavabevit.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/1f343468c155613184718d4f6336346f/61555104412.pdfIn PDF document text
    • http://lhsclassof1971.com/clients/74120/File/nupiraferavatoz.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/0e03b2601102dd585026f0940e0d8f2e/53404978366.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdbb2d5ff20---vuxezinepobuxesasogok.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/lugerukujameloda.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/17120786894.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+make+a+fillable+pdf+in+illustratorPDF 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_off0000e6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C8 17288 bytes
SHA-256: 76464c09d65720d9735c04bc76eed18ac65413bbbe1fa76282e3bfdbcb178c3e
font_01_sfnt_off000113ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CA 11068 bytes
SHA-256: 3dc49eee013c7a67cb8ca70acfb33d0b0586b5f3885914fd588ceb67cc1f0f9f
font_02_sfnt_off00012d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1