Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fbd0e7a798c9013…

MALICIOUS

PDF

75.8 KB Created: 2021-06-27 13:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3a6529d50494a80d10adaeb06bbe7e66 SHA-1: f15284e5b132b46ea57cafcd258c70b028ef7a23 SHA-256: 3fbd0e7a798c9013f1f02c024743468d3fef770e472dd989a0f863a30cad426d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically related to phishing. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://huntic.ru/uplcv?utm_term=education+tax+deduction PDF link annotation
    • http://moristas.com/userfiles/files/merizolusazateverarivexe.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///37815370956.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/9c09e3c7aa4e3781562a89d126a27354/51967497818.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/dudugixu.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6da8e330d7a6e7469c1e674e9a95c876/ladoxovibeke.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/eimr6t0o1o2prk2pk63p8uhp1a/xawiradifudavidafag.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/74fq3kmkdo83q4td8sslvedpdc/gelasokejo.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/jidotikubabuted.pdfIn PDF document text
    • http://inglewoodreunion.com/clients/68690/File/tegazoledukigirivafiwene.pdfIn PDF document text
    • http://mrsinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/25272044153.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/0d4018bd202e2e7cd8cca8b3bc24fd46/mepadepezowosavilunerido.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d676d9304a---roferutowemolafajanilugar.pdfIn PDF document text
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/73676310248.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/wasikelura.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/96214070211.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/meranuweroredi.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/70179436543.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c15c239e52c---tusugek.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8999f20875---8612357209.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160a42b88c0723---vovigos.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/4883222740.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/mumaduxazuwibozefonasoxi.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_off0000cac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC3 15688 bytes
SHA-256: 4e8c3e9283bb28cc338898c7cedc2f225a0b1188eb6c647b7417520df4a620ef
font_01_sfnt_off0000f309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF309 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B20 10232 bytes
SHA-256: f36f3fdf84c19aee1798fb1bf2c031d01105f6af517980b1a8604a95d0f3cb92

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