Malicious PDF — malware analysis report

Static analysis result for SHA-256 821e3cdb0d1e04a5…

MALICIOUS

PDF

83.8 KB Created: 2021-09-17 20:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6a967668ef4003d7a8e641acbb6b23ae SHA-1: a7077b9edc1fda2ba5f47c2a754a1a9b1f8ba3c6 SHA-256: 821e3cdb0d1e04a5815b39431ea64002e5778905671ea946f0c515ffb8d2b3e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to potentially harmful content. The presence of these link farms strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/fekavosuramawozo.pdf In PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16143835ba5fcc---panunuxokakozejasipifijoj.pdfIn PDF document text
    • http://rvhifi.cz/files/file/26820487554.pdfIn PDF document text
    • http://balalajka.nu/media/27039312704.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/mukunuvezapuvikebajulone.pdfIn PDF document text
    • https://olterus.org/contents/files/47862771482.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/jugufakizupowigeta.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/96479196996.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/1g7v4443ehudptaam4g47pn001/dativininiwerabejawu.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfcdcce766---23404726685.pdfIn PDF document text
    • https://euroialinsol.ro/userfiles/file/xelikawivejifogekesa.pdfIn PDF document text
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/wezedowarusa.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210917231315.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/xuxubafupujesodategasilov.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/94268022974.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/jigejuxa.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/wawiwiritikuligavujatafu.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/kosol.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/bozumomusedoxagegigonew.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/30377807537.pdfIn PDF document text
    • http://sartor.ru/upload/files/85553881813.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/zeduf.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/zizevokinogakat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+hard+reset+chinese+tabletPDF 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_off0000e1e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E5 17928 bytes
SHA-256: 4c2027a5c6ee69ffbece357275a0ad8f54cc4723b977c5f9aa93608921932b93
font_01_sfnt_off000110f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001290c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290C 10684 bytes
SHA-256: 1598aee8a9940b718e27ff950bbba61c02b0cd1202edfe657f90a8b03bb9adc9

Open this report in the interactive analyzer, or submit your own file for analysis.