Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ec9f4220887d3bb…

MALICIOUS

PDF

90.2 KB Created: 2021-07-27 02:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 71cc95f85d9087a28cafe831f3496fef SHA-1: 92d258794b4a2093ace04cab53bf4b63a3859f23 SHA-256: 2ec9f4220887d3bb55ae543078929f9b56519007a0f79a31ac6a2757879a7db2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a common tactic of luring users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/00792b85e58cb0ba12b3333844401ab9/6335532060.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db8f18d753---bobatufuko.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/a809324437927b3184d75209ac8dddd3/wazatemufitisexido.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160957fab87f97---90736887580.pdf
    • https://easypayindia.in/userfiles/file/40518286851.pdf
    • http://vako.vn/app/webroot/uploads/files/negip.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/d36f6ad806d39f693ec25dbab33e5ea8/98034988255.pdf
    • http://www.aluvascientific.com/UserFiles/file/71044046075.pdf
    • https://namlongadc.vn/uploads/news/files/burekexosujar.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e39aad276f---luvaronega.pdf
    • http://zenithmetals.com/files/93120590344.pdf
    • http://karate-talence.com/newsite/userfiles/files/takexutorowokowopikofax.pdf
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94770978114.pdf
    • http://cdhsalumni.com/clients/28864/File/tarax.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/eb0d29ff4052cb8637387f640171f42d/kexifimeziwifatap.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/ad585556cf0b3dfca9edf0e35651758a/19764208420.pdf
    • http://creative-format.com/upload/editor/files/35425794780.pdf
    • https://xn--80afc2apd5n.xn--j1amh/upload/files/2881980768.pdf
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/65171697685.pdf
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/dad3b523a128c3cd5d55ea333b923a47/kasofubisasisimerav.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e634114840d---70275886346.pdf
    • https://pearproperties.in/userfiles/file/84652387161.pdf
    • http://mynigaoe.com/upload/file/20210605094144.pdf
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/43690164619.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=jpg+to+pdf+converter+software+free+download+for+windows+10+64+bit
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8f4.bin
e5f4fe4b77334b54e4bb3fd55bf7f956e8bdb7f760f040d295a7a80b1d378af6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F4 11500 bytes
font_01_sfnt_off0001140b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1140B 16792 bytes
font_02_sfnt_off00012c1d.bin
72a688026a6222b2d11cb33202afc2a28e857524c0c019543ea8741f58c2ee2c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1D 17184 bytes