Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0405436a13135b0…

MALICIOUS

PDF

71.9 KB Created: 2021-09-04 09:16:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0d801e29f93cc9c21a6566b883a9a3e2 SHA-1: 191852fc22c1f5e6190dcb0ecc6af8cc3210fdb5 SHA-256: f0405436a13135b076e3245982aeba52f99feb714056d7ae8a0ed3d9b83caf19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicative of a link farm designed to obscure the ultimate destination. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple external URIs and the link farm structure suggest an attempt to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 https://micast.de/wp-content/plugins/super-forms/uploads/php/files/cge0b9fei9ssnkbg8fdggkf6bp/75988707033.pdf In PDF document text
    • http://asesorgubernamental.com/images/file/wegafepo.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/wusog.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3d9b080124b92efd8b84cb784771d225/berifa.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/zitife.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/34071922092.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/89332198722.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/dovizazowuxizumo.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/pepupafa.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/a9mr9l30ielio4v01j621ibrp4/vepomobovozuja.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/ebc068745e28d786fabfb1f833def84e/14092601809.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/pbhp49826vh58m9mv8uiesr541/kubolaviwetilubil.pdfIn PDF document text
    • https://wmu24.ru/media/file/84978473256.pdfIn PDF document text
    • https://davnosti.ru/upload/36221185682.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/sefefekozos.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16081bd2b9921f---nemepugo.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/84039732441.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfdb6e4cc1---zumevelevi.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a60c107870---sumasorivagulujizotuxo.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/a81034bf9789900be009db2689dad3e1/45103533736.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/59265797545.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/fugedegoforawimekan.pdfIn PDF document text
    • http://rts-3.ru/upload/files/27393779432.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/c1v322ik8crgajt6lbrgui2hg0/vesisaparajovefo.pdfIn PDF document text
    • http://cfacgroup.com/uploads/FCK_files/file/depajibu.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/79624824960.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=traitement+thrombose+veineuse+profonde+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB772 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF84 15924 bytes
SHA-256: 97c1c3e602ae5a6adf2b05db1a7ffee310e6a253c7cd3d33a61ba56a688c82ff
font_02_sfnt_off0000f6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C7 10984 bytes
SHA-256: ebfd5890acc692aa162e22066b0ccdb7ba357c4112c764adb208fbcc37a5fe01

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