Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3b4ccf95827562a…

MALICIOUS

PDF

76.4 KB Created: 2021-09-05 19:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 976f9abbd1a4d5a0d60674991eee4585 SHA-1: 98787d2535ca6e8f319ab236b0424ebc24e9e25d SHA-256: d3b4ccf95827562acdc68c0b9821b29d224b8a204556d835070cb06c52ea4f03
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous links pointing to compromised WordPress upload directories and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca446ed68---13606292331.pdf In PDF document text
    • http://ruihuitax.com/files/file/lawojijufa.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/c5808d8bd00ad56c22ea5402986d3950/fukafinipepevasomedov.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/48483333511.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/72916765302.pdfIn PDF document text
    • http://fxlcd.com/upload/file/nowapok.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e10a263387---21385858016.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/38243916546.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16071174400d14---xoxesewalekuf.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d168a6f8d---84727267784.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609176697154e---79530752427.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8500bd9b11---87674241946.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/162853508967329037225.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e171ce50f0---jupora.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e80309e9f5d---43513771274.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/mutakidegatukowikufal.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d562ab27f8---xoras.pdfIn PDF document text
    • http://rafaelokazakov.com/file/45271915196.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/wafememapibikogiwenevule.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/be2ec1e99ef62b0d84217fdb44c7ee94/2270207955.pdfIn PDF document text
    • http://proxima-design.cz/files/file/1774557003.pdfIn PDF document text
    • https://morabia.fi/images/file/xesaxiwerume.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=triste+fim+de+policarpo+quaresma+pdf+baixarPDF link annotation
    • https://grupo.iberia.com/js/ckfinder/userfiles/files/refezobojoledipo.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_off0000c102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC102 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD919 11128 bytes
SHA-256: 613ca3b1e167515c1d83422db5d7617bd78db53cee456d103352573b55d199ad
font_02_sfnt_off0000f2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A9 19768 bytes
SHA-256: 009ba500ef85c394f971866b70deba71280b58cb78201d32e7a368406ea3cd7a

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