Malicious PDF — malware analysis report

Static analysis result for SHA-256 9889cd84457ff8c8…

MALICIOUS

PDF

73.9 KB Created: 2021-06-14 20:35:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 81bbfca58842d05c06e21c2a96b6fe60 SHA-1: 3bc755a76f8960cfda38f48cabfb8f7fc58d1a9f SHA-256: 9889cd84457ff8c81abfd8505b21a23a40f293c517b17f2389b2e5f2700a5f6e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely serving as a distribution point for further malicious content or phishing attempts. The embedded URLs and the nature of the link farm indicate a clear intent to redirect users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://allytemp.ru/uplcv?utm_term=allianz+arena+plan+pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/94ac721fe4cdea89677b6acbefd6b05e/ziraxerifowuk.pdf
    • https://dijitalsanat.link/upload/files/2877425402.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/43040f57c002c8aa5f1929c690d5a630/99768675007.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b28acece2d---6013501416.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607064f6950ef---10990678885.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ee6c1e30b---sejiravuwepulex.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/67ab8b6d4f903c2528ec84d5ba06b736/tibedelujipijibe.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/fd64feb5cc885de78e44904673798893/1240373646.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/lb4de0hs747mnvi6iomucon8i5/76259750061.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080710a6263d---tedugapinavupixa.pdf
    • http://hum-lucknow.org/test/fckeditor/file/64314035908.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/0db47f5965ae71608dbd6afe6ec60128/74523262772.pdf
    • http://prof-cosmetics.com/upload/files/75328495289.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16087a4326ca07---pusukulovumud.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4b5.bin
ed70aaf2cadd311f870fa03ebb93975426ba9b8ee62c7b2d92df31d6143de851		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B5 4896 bytes
font_01_sfnt_off0000f578.bin
d4dd1e7c1d614ace83f646d0f8aa1ee2ee100429df20a1b7664e57bb539b9085		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF578 11356 bytes

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