Malicious PDF — malware analysis report

Static analysis result for SHA-256 d86754129bc9dc4f…

MALICIOUS

PDF

96.0 KB Created: 2021-09-01 10:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d32a9920c76b7707c5ef17707afe7997 SHA-1: 323e8978c1ac6d68bd9578cf7a9a14cdb1e82a17 SHA-256: d86754129bc9dc4f29c5a94b656f830f4646fc9c7de579b9b6876075a482aab4
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to phishing or malware distribution sites. The presence of 'utm_term' parameters in some URLs indicates a potential phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://crysiq.ru/uplcv?utm_term=committed+a+love+story+pdf PDF link annotation
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16070163dbd788---doramulevasegaxose.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/v2ogs0f1kkvvr5fbel7to9r0gt/samufenoxuvu.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/nitodusuzop.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/88180922186.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/niborezirito.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/nubaseruzaravo.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/8bbd617c0738d0f46f0fe2327b855974/jekepabukikanituvapev.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/jisuxunupevu.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/kijunomowoxed.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608936277337d---xivenefonipef.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/e5j04o8o322d3voqi7g4egc0un/vigovovaxajajudivip.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc4246ecd4---50014243144.pdfIn PDF document text
    • https://norservis.cz/files/files/304875706.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/tefediwaxezutaviki.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/difetekikajeb.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/65c7e6db52a38fe1bb47012ea0581fba/81141392188.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc333c213f---rudojorarabakofamokopat.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/kewetovoteputofor.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/33381315690.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/83558034089.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210610045918_ocbpkg.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/61766887694.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6bec19f26---72621010626.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_off000110c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C5 10764 bytes
SHA-256: 22c5355739279fbd11c14a849c4abd2d614e34702935f4c937d0a42af6ff2ab7
font_01_sfnt_off000129a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000141b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141B3 18016 bytes
SHA-256: 967da8a312ebbba8ebb433982bffde42f275421e875e4ab97a22e3129fe4f7a9

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