Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4bd5af1b19e3fa4…

MALICIOUS

PDF

97.5 KB Created: 2021-09-02 00:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 98766aa3e9ffed506a05a1b795a04f54 SHA-1: 3800decf75ad1963c51ba80e2089e5de035293b5 SHA-256: f4bd5af1b19e3fa477baef37f7f3433567c037349e5758b85acef7af427d3029
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting it functions as a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://crysiq.ru/uplcv?utm_term=bloons+tower+defense+pc PDF link annotation
    • https://danielfelber.ch/userfiles/file/wawigubolagupesoporanup.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/8lq4eqnnung63umeoki1j9chkm/93249184539.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/60a07593b38d50d8a80794168b6f0859/bekolazubizoxulanamepi.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/gimopuza.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/dutukokenasotibebisumar.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/duvawozamiwevenonikopa.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/bevakokijofinuw.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb08c81d1a---gobenedivutabusorilos.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/70bffec1814010383ab571f362e282ea/zumugexomir.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/2051041309612de68ade5f7.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f67fcbf845---nasusef.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/4aed352e16edf1151b18fa97e082f9ba/xomubumapegozozugev.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/20835154078.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/47818392511.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/54110851798.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/90507523050.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/apog0uabqqmnvi7b7ejcnslqlg/49473428341.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210814154300239.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/93467184248.pdfIn PDF document text
    • https://petala.gr/userfiles/file/gebaduzojage.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/22510225207.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_off00011576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11576 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8D 10496 bytes
SHA-256: 91369cd0262e65dd5642c79379d67cdf28b4caf82f48d2926dd984005692b705
font_02_sfnt_off000145a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145A4 19188 bytes
SHA-256: 7ec5acfb3735f74e67615323ec82b66a21567f7c61c3c73ecd7bef63bfbdf880

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