Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b9f3a742a4ee6b7…

MALICIOUS

PDF

86.0 KB Created: 2021-07-08 04:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 393d18821f6bd2d19f58174a32248e8a SHA-1: b3d6cba472e6a021a31e9ea9888cf47de9f03157 SHA-256: 1b9f3a742a4ee6b7fbbfe935cda6fdc13526c87e044fa6c6537dfe238c6ea506
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm patterns, indicating it's designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious link farm, a common tactic for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://smidgel.ru/uplcv?utm_term=common+name+for+epinephrine PDF link annotation
    • http://cdmatik.com/uploads/file/vafarenelawaka.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/63b6ae66fdf24e2bd547a9ca781ed936/13558098050.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/76112991056.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/sifeweputopebilasapan.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/253n6n9poatstn0thge28d6r2r/85497333185.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/87094372529.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/dizemovejemudisuzedixo.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/zolelozizegoxidosi.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/84144823110.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/51405724872.pdfIn PDF document text
    • https://dienlanhbachkhoa.info/upload/files/65304105942.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/66531986713.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/e6na3taju7a4h9d36p55fq7nde/92747212206.pdfIn PDF document text
    • http://wych123.com/upload/files/luxoforanero.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/rilobevokiv.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5dfe5c0048---8158745421.pdfIn PDF document text
    • http://omg.su/upload/File/sisipaxiguzinagifavisugos.pdfIn PDF document text
    • http://siembra.me/uploads/files/mugepomidutawijewipova.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/j8qs3fqoijdlvp0tf61mi99nlt/jarol.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/lujuvugifapajovinojowasi.pdfIn PDF document text
    • https://jobtiara.com/files/files/razot.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/8910208559371dc75c7337de16e628e6/64823432566.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/bc5f7bf2bef1a71720311be3586aa337/sesipawix.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_off0000ec69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC69 10340 bytes
SHA-256: 82b0efc1b85180c825b4a43bd9dab8a9b1d36ea129b327e47ab69ee98530352a
font_01_sfnt_off0001037b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8D 18216 bytes
SHA-256: 69e6e48ad8ee2ecbf90c4d8af6f93972d5e49ee6528e8a4bb1b56533df8bb652

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