Malicious PDF — malware analysis report

Static analysis result for SHA-256 185c5d38bab61b8f…

MALICIOUS

PDF

102.2 KB Created: 2021-06-29 19:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7f1efca1d7af6c9eb183d1053a9aed93 SHA-1: 8bec54c761e6213c5d87d6209b6456a89c81e5de SHA-256: 185c5d38bab61b8fd81510ce43d5629790e193accbd5877359865a53b3c8a04a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It contains numerous links, many hosted on compromised WordPress sites, designed to direct users to external, potentially malicious, content. The primary goal appears to be to lead users to these external sites through a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

Heuristics 6

  • 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.
  • 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://infrive.ru/uplcv?utm_term=rose+tinted+meaning PDF link annotation
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfef03aa505---regelalepitulopobugu.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d39ab539968---jurov.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1dccef987---wepubomarasozunazosob.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/0a8q9r1cg74dhm9qm9g0l2qkg1/wekipifoxofadijomen.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2edb58d9e5---42614206384.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2dcc9dca18---tudezokipu.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/66182591426.pdfIn PDF document text
    • http://velocimapper.com//webfiles/file/99263699532.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/96324415995.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/3d95b366b488fb9df3e2bf795f6b89f7/81273964039.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/bc0a07f400072139a979a52f8af43c2c/potiwujisuw.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/e3480b4efad16699c6f0ac1d1bb81da4/65118409451.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/42188797243.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/91a102479d3168db3c585f055f8d1424/gumeduloxeji.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/dc450a2d0f9fd74f3c903ff2e12a248f/85752467329.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/15234080395.pdfIn PDF document text
    • https://zegabilisim.com/calisma2/files/uploads/gimesegikejijabexevaz.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/1ca6babad291ae4d7ad287197ea27157/jaxepazerevaxujuvuda.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/4150b25a63fc980c1726f25d59ef48c6/41152035116.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aca0553f037---zoporazosinoj.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/venepewodis.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/jafukado.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/15433237593.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/89184397388.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_off00012ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBB 10488 bytes
SHA-256: 46c205fd161610e4e3355c615e504e4242eaa99a1345d89bde24bb488a2cd64c
font_01_sfnt_off0001465a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1465A 17348 bytes
SHA-256: b4f69d190ca835099306cad884e6dbf5d7e2f7cdd145fc850f51635d56409545
font_02_sfnt_off0001737d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1737D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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