Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4f1b0ce1e4e05a7…

MALICIOUS

PDF

99.7 KB Created: 2021-09-04 06:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 75fe2368a78a2e33ffca4a93c514ad90 SHA-1: cbe31f25361a4a7c8b99371d104a1190404456a7 SHA-256: e4f1b0ce1e4e05a7b3116595e452965097df98bd195a783b68192848f66a7b22
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/05f20888ee922d73e6a263997ee1b6c7/76621969230.pdf In PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/86501813946.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/wizovegorovadogubusuva.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/vodogixusopevukira.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/28e4614217e5e61ff0751a9889b61eeb/levinonafaxut.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/73568496672.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/fupubuvodinetowigulivod.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/635bde375ebc2511ca8959a36aff031b/79641463485.pdfIn PDF document text
    • http://4bx.pl/public/file/67625646317.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/xiladidugo.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/nexalebakev.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/tenomu.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/77037192899.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/fawuruponulo.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fcdcee6ad---butogek.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/92609008811.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/co0us6lnoi79nakjglqvp1cve0/82896743509.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/rosadulizasonaditesu.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ba54307d5bc---74268826804.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160888bea40850---4146861230.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/metanipezuwevosagosipi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=paediatrics+and+child+health+book+pdfPDF 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_off00011d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001354c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1354C 10948 bytes
SHA-256: 6e65062846fa7235165b65ce1b67a311b180d8a6a87fbd1095b8181eda75bf5e
font_02_sfnt_off00014e4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E4E 19640 bytes
SHA-256: d8daac2bbde7352852d34ed9dda7a9162fa7a6c2d175e0fed13c8163ffedc2da

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