Malicious PDF — malware analysis report

Static analysis result for SHA-256 39546a83ed8a572a…

MALICIOUS

PDF

89.5 KB Created: 2021-06-29 09:14:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 9a99df57fcb805a645483cfe2ea04f16 SHA-1: d6e174177d7e0992c0023448dfd644c76315f8f3 SHA-256: 39546a83ed8a572a2a9de1ba7760fccd17481654b0b7217d4f9ebad0ea7ef2e8
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to potentially malicious content. The PDF structure itself does not contain readable text, but the heuristic firings strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/3955266e96172936079fe198f536ce9d/pefitofojizaw.pdf In PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/99bed04231b765b1fa96304c4cf7afd9/mudijemu.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/gecpf4fn5ga3kta4saaqkghjf2/88210451067.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/lejuloj.pdfIn PDF document text
    • https://groupunsur4.com/contents//files/68271048047.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899920a35f5---pokebaral.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/c9928uiem6k5s609j5ibsnp2lc/85576982482.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/78b94aec1d7cca5f7b54a856b0a20e51/pidenoburu.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/tofivubuso.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff92832414---52958765971.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/q5a5njbkrtqmpk0qtepat0boe6/80610723517.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/75646052630.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/9004274804.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/2886be4ea11010622904314a0049862c/67594099097.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160accf2f36c85---mifosoperofofusitu.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/2ff62fe4f26f626a66a083849ae6dbe8/juden.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aabe18eb3e---susubebozazedumana.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/2pdrlh8o7nd0mii0oaf8toe56n/dijoxuniwuvetopu.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/7907057a3e3e9fc5db9c83de288da653/fazegi.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb81466d7b---13404562565.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/548524a24fb12b0dc025f9931051c68b/66058140750.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e2815755d---91129497263.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/kinarixapejawajib.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a66f85a14d8---40897647850.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=ghd+sports+app+apk+free+downloadPDF 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_off0000fc05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11417 16828 bytes
SHA-256: 4897e629ab70cacb098083fca7e5eebbcea54fd8dadb0d715585d16527f50e06
font_02_sfnt_off00014005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14005 10720 bytes
SHA-256: 6a7cd5d7ae3390f9b71d12d4a88dc70315d232245dc84a5b01167b7f64da0105

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