Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a40701e52a86ca3…

MALICIOUS

PDF

69.1 KB Created: 2021-09-26 05:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6a2f70c2f9cfab3b541a1c4ec5a3cc41 SHA-1: 73e1dca4cb68ec418627fc275e03293f2da24d43 SHA-256: 0a40701e52a86ca3700f727e71e1a7c7d3f530e62314b8d973b09c6c7c54c950
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=plex+on+android+for+free PDF link annotation
    • http://frutapac.es/ckfinder/userfiles/files/78765837287.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614eabd79d489---85765988422.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/9307763216.pdfIn PDF document text
    • http://cuahuyhoang.com/media/ftp/file/rewilipuxogug.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/lesuranitekixoxatuz.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/a36b140d07c36b6768c83bda1da59883/tugatowapokabozebupaz.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d07bbd496e---12341973423.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/85279485382.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/jixekufo.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/64102048290.pdfIn PDF document text
    • http://sibmaxi.ru/userfiles/file/bozadakizumek.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/59372395276.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/nanas.pdfIn PDF document text
    • https://redac.ch/upload/dunerutode.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad9a234105---69854704458.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/49410733901.pdfIn PDF document text
    • https://eguiders.com/uploads/10650655681.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/39978910945.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/pofanezavilagofotogusiwa.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/28757007385.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/liwotolafizukufoxunujubef.pdfIn PDF document text
    • http://ashioke.com/images/library/File/libigizosugel.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/virumolevoko.pdfIn PDF document text
    • http://anpharma.net/upload/files/42904561778.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_off0000b256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB256 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6D 10184 bytes
SHA-256: 2383b43e0637bdf606803bed2db41d67f04f939674d103cd9e943222a9ac2ce4
font_02_sfnt_off0000e14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14B 14784 bytes
SHA-256: ea73b890bf1fece865a2dda336acec664850ab9cff0c1da071d78aa9ee124a00

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