Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a27b1a139ac7ce9…

MALICIOUS

PDF

80.9 KB Created: 2021-09-11 20:18:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3138d4faffd67d86d20e6aa16cf76882 SHA-1: 52f070f1a95d85ff45e393dd84c7c9ea771dbf05 SHA-256: 3a27b1a139ac7ce97cef7b90fbe77f7bae1b9ebfb9abf54e8575fd8f2faaed69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a significant number of embedded URLs, many pointing to compromised CMS uploads or disposable hosting, forming a link farm. This suggests the document's primary purpose is to redirect users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://coretry.ru/uplcv?utm_term=2+player+android+games+online PDF link annotation
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/54150452264.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/parila.pdfIn PDF document text
    • http://teledirk.com/d/files/dikekulavimoruvenirejop.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/buxipupik.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/64399920492.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/0e57a38e0a65f3a2fc6909580be2f7a9/74876109074.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/bazubozafewuruninaxeb.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134513f9a822---12549672310.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/foxuxan.pdfIn PDF document text
    • http://t-cso.com/upload/file_folder/file/lotijolupiloroju.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/f27b0406588974c0bdcd2ee529d691c2/telurusatefefixiw.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/wulogemitag.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/161315db6ba226---begavagosobeja.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16139952ddf054---lovakerumudiruxulozonavu.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/jikiwidatev.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/20398218829.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/dekugufolobudedodu.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/83980206913.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/gaxiketaloneri.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/fomutenuwitemum.pdfIn PDF document text
    • http://na3.it/misc/file/dikelalagoralajupaxunik.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/kerunikozosotufesitirukug.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16135b40194c32---pewosatarolakutu.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/4646354276.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/46756150721.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135ec39482f7---85461486029.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_off0000d84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84D 17312 bytes
SHA-256: 533c4d09bb9010f59e8ba537880af2e0fd2b5963bafb3acb39604124ddda15e5
font_01_sfnt_off00010566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10566 10776 bytes
SHA-256: 3d6437a959f447aa97ca7e6d233c7e9f23db9f7c9ed59ad47da153ed462f8aaa
font_02_sfnt_off00011dfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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