Malicious PDF — malware analysis report

Static analysis result for SHA-256 e45cbb54d8b78323…

MALICIOUS

PDF

82.6 KB Created: 2021-09-09 05:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8c73caaac20cadf8a65594eefa77cdf1 SHA-1: f714c6c1a36cb63ce5c52765263f1091e00ce511 SHA-256: e45cbb54d8b78323a8d8aaad887ffa5c9e387f630b9d3936aa81e8cf69b75d2a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or domains commonly used for hosting malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://medvor.ru/uplcv?utm_term=clemson+football+live+stream+free PDF link annotation
    • http://studio-castiglioni.com/userfiles/files/tixepuxamojezusezix.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/24679834253.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/nedarebabudaniwukotoxib.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/xokabonogagufirewejefodo.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/74535003eb1b211cd639e089f96f3a24/67153247565.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/65021933603.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/80298418882.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/rekagubigopugoba.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/sofawamonoxoma.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/71655830192.pdfIn PDF document text
    • https://hirurgija.me/files/fuvikowati.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/202199751513224.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/sutefabonu.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/vsl8jh569nugfoqo0k914nmt7u/93082923697.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/59069089707.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/pevulesagu.pdfIn PDF document text
    • http://retailcop.ca/files/49667959566.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/88148019514.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/t4cpo1vvau0gp4un0tff96ai45/bagixixujagoruzexukodara.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/bewukefu.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/tajug.pdfIn PDF document text
    • http://inercial.es/uploads/files/62947103600.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161377eb361ce5---99951110986.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/39476078723.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_off0000ddeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEB 10612 bytes
SHA-256: bf0d073cea188d17ff966ad9ae5ad03b477c8c0d2cda5c09e49204c4969bde4e
font_01_sfnt_off0000f639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF639 17864 bytes
SHA-256: b0e28585834c85c4abbfcd224d7165b15044b8c8c5165d652cabb83698a7adb4
font_02_sfnt_off0001249d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1