Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6ac5c552afc429b…

MALICIOUS

PDF

75.3 KB Created: 2021-06-25 15:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4f23ebe2b25a44866f5169c9d27a6706 SHA-1: fc5a6332b17a6df186680598cb880d240bab2f57 SHA-256: a6ac5c552afc429badfbbf6c90bbf6a9806ef424fd2445ec3bf1da7d8d604670
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and link farms points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://drafthe.ru/uplcv?utm_term=it%27s+been+the+longest+winter+without+you PDF link annotation
    • https://dalyanestate.com/userfiles/file/49605468580.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/60371eb4e14729e7e183176c2535d92d/5859724604.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/rexebo.pdfIn PDF document text
    • https://sankohomestay.com/userfiles/files/zoteguvubebunoliwojil.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/ekjlgof74fhfgbtsi2jvjnrd7m/48401903568.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a776413f9bf---fokebezaz.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/bf7bdf1468e341c140aea8bd76c7ebfe/51864793724.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075827cafde4---63099852871.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b04c66337---33472615866.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b826b1255dc---99434115537.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16078e7a2c8c10---raxoledik.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091091a6c3c7---modijinisemagosukuwig.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfa914f1ba---fegekewiragifeteb.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/605768aca709c98d0d55c981b8e20eea/nivuzonenedefefe.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1624572966.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d50285ba5---lenexoj.pdfIn PDF document text
    • https://begili.com/uploads/image/files/fuzatojowelilinoneneno.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/83331398563.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5780101a4c---vaxilevilutajexexusopu.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_off0000c3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3D0 16884 bytes
SHA-256: 030f4196037e21ba94d742e0f025d7017688bdb494c3635c74076536bd0fb2c5
font_01_sfnt_off0000efa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BA 10652 bytes
SHA-256: f0b645334eaf47793e63725d18eb546d95e2dc0bf2a188f66fe0e5cfe9f6f68e

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