Malicious PDF — malware analysis report

Static analysis result for SHA-256 41a952e5c7b7fd3a…

MALICIOUS

PDF

104.5 KB Created: 2021-06-30 21:19:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4c094b273372c584d0d846bb85a70c4d SHA-1: f77e145b4622a7ae7061b251a3210dd905ed8fb5 SHA-256: 41a952e5c7b7fd3a26850127be65ea7e481d79f8649dce4350e3cfd4df3afd1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure, but the overall structure and heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9687

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 http://mamam.by/upload/File/file/bawagudunetofunuxa.pdf In PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081429d47dd2---38790228372.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/nn29at3qven7886jb0rgj6agps/vupanafowozabuzunukuwip.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/18r9ig63rdbj1l4tv49kd3ce84/bomitodosodokaga.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/a2b52af51a60981b08d72c6337ff8fba/birukida.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093d7885e607---13427480978.pdfIn PDF document text
    • http://vasamo.org/pds/userfiles/files/nupikemokiw.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094846381e5a---46546518838.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/mazidibawudevazigemuvi.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c27ac6eeb---68429045686.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/ab4b23231cddcb3b5ef258f60a11de3e/dedan.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160973fc9ef67f---15682843594.pdfIn PDF document text
    • http://pratiklinik.com/img/userfiles/files/37750290118.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c46dbf68b92---86567209268.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/033150b396bff16cae0e6deeed4c582d/1803408444.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/ccd32fdf4b85fa3aecdb997f839126dd/kejubukisew.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160db77e5f12f6---65038955287.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/waselidilusimabudol.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a736c53f1---vaxigimexibuxawowom.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/xufinanuxurapep.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/guminaru.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/jjs84lcppjauep1puf33saq659/tusid.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/caee6f95ebc6973523c9db7a6be3bfa5/86946052806.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/totitokiruvexe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=let%27s+rain+check+meaningPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62D 27532 bytes
SHA-256: 37be2f6526eef57807b7b52a3378d7758f58bb5737a8b5693543c54a7d3dc8f7
font_01_sfnt_off00013901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13901 10596 bytes
SHA-256: addd0f4a955cba50f45448b3a0e6fcee5263551bbbae73358f8eebaadcba4ce8
font_02_sfnt_off0001510d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1510D 17568 bytes
SHA-256: 585b243cf6cf7170f718d6104026f66c9ffe4b887c87fec551a72ab41467b29e
font_03_sfnt_off00016b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off000183a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183A2 3600 bytes
SHA-256: 6a7bfd195c008cc60a68a759b8592b668c537243f7b8f60dbebd3e4866984cbc

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