Malicious PDF — malware analysis report

Static analysis result for SHA-256 78fdd731fe3113ba…

MALICIOUS

PDF

73.7 KB Created: 2021-07-03 00:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 3e435db6193d9f708295ec3954bace46 SHA-1: 4ddab2f74fd6aa2a30a2767f3b3500de0e0c7df1 SHA-256: 78fdd731fe3113ba9921a7a22f55efe4f5daf58e33f36edabe78dff8ca3e5118
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the nature of PDF exploits often involves JavaScript for redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://nomylo.ru/uplcv?utm_term=module+4+investing+answers PDF link annotation
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b407a35db65---15652127638.pdfIn PDF document text
    • https://mimpishio2bet.net/contents//files/pezaxuzetudutaximadu.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160828fedf198e---25770571569.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/e72276c1e90c3f8909cf0f46707a1ffa/90214896539.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/75957527018.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f6e31988e---pupeworodamule.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db0e66b6c9---nodokexapikiluvudesow.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/gikuz.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a340f5d2d18---webasalov.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/c75e2c5a5e40ab1904bdbf7162c7abba/teradurosexi.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05e92de8a0---64454976428.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160729b8e72862---wunafo.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/uqgg9jqhk6v7mjou9fc76norra/nutakifopubifedi.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/5f3c637bee8f4f92a958187069d8e6b5/31396026646.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/48298257036.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/145dc1a9383d634c4d542cebd67e0754/97411325389.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf5b651831---31410404240.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/guwolodebav.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/c9da7efdf366fc041630cde90650d508/39507500096.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/9r4pbrs7uheaejp8fkq0cs7fp4/52434405244.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/diriwo.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5e82eef83---zowivolagijevexujemufeg.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d75b04e6050---38422689586.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078abf81e430---21189144523.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/64398335566.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/dawovujipuku.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_off0000bebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEBE 10748 bytes
SHA-256: 06e2a0724429ef44e3fb67b77e816da4c6bd0015bf018aebdc364334dfd73302
font_01_sfnt_off0000d77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF90 16176 bytes
SHA-256: 8d622b1ab6ba24a88b546dfbd5fb3fa26159515227a00a344bb5bbd47a4699d7

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