Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1cd208e237f60b3…

MALICIOUS

PDF

79.5 KB Created: 2021-09-20 14:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ff00894e320cacd84502782766f28d20 SHA-1: 2afc28731020d03200e09fb33233aa5ab9440d1f SHA-256: f1cd208e237f60b3dfc75e68169e67d9680ce2f79a60930cc4c464f257f4c85a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download' button lure further supports a deceptive intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=how+to+check+if+phone+is+rooted+or+not PDF link annotation
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/e4c147615db19dd64448e7657a8f2ab4/2024243564.pdfIn PDF document text
    • http://samtekelektrik.com/files/29747393736.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/xulawibapafoje.pdfIn PDF document text
    • http://deauville.ru/files/file/gusubadufidiwigotubud.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/xekotapaxerud.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd68df027a---wefulujurewavuwunejebuwil.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/zodirilifijawotiwukizevun.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/49818694877.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/161471fe58acf5---mekosoxe.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/89467900704.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/rikamazemabavalubarir.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614546033bf49---voritewibubof.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/19417228436.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c695c2c26f---22112639627.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/momozawaje.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1614813c9e7aad---dajajemafavo.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/manigegesixiripafavasubo.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/dedc75fdd18a550b084bea32c0bfa069/68639328906.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/tevadowora.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bebewutudogiwupariwixu.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/13840387529.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161452c487c791---39499405817.pdfIn PDF document text
    • http://philipsphotographystudio.com/wojikidefetosupubunomun.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_off0000d30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB20 17432 bytes
SHA-256: 3c83141fb5b230c26ddc1692ba315385c0a9c53cdd8fcd7dd4a29f2921d6c23e
font_02_sfnt_off0001183c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183C 10676 bytes
SHA-256: ab7438cd0f88ae7809f7978bca9f1f6dfa94d056692584fd1fa50c48698bcfc1

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