Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff9a925eac7164f9…

MALICIOUS

PDF

71.5 KB Created: 2021-09-01 00:27:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3f7753e5e4252b1ce837435ad762fdd6 SHA-1: 853e65d6a5262ead9124c5bd3886d44e544c3d7e SHA-256: ff9a925eac7164f930739bda92dee48b2d84c722b538c6535e11ef59cf1d503e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution attempt. The presence of external URIs and link farms indicates an effort to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://drafthe.ru/uplcv?utm_term=nice+word+that+start+with+o PDF link annotation
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/piwirupobipovik.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d21323950f4---20606468039.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609710c94f3c7---19716761143.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/04e2bb0dd349a7dde022570a60d4bd80/98975790155.pdfIn PDF document text
    • http://geose.ru/userfiles/file/27031113671.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/98e22907565b5b1f99d01f5c1b5d7408/zexani.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/tovadebero.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/14450233054.pdfIn PDF document text
    • https://x-software.cz/data/file/zuxadejevemozuf.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/65946196702.pdfIn PDF document text
    • http://voijin.com/userfiles/files/96758338534.pdfIn PDF document text
    • https://cecprint.com/images/file/larenorudumaxevog.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/fefopaputawazi.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/4vgalcnhu42lvtdqpqpjr8e83e/jaxejetopuvunowojis.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/87kc50lktmt5djge2om5sumnb1/vejodinidunutukobomude.pdfIn PDF document text
    • http://spec-so.ru/sites/default/files/file/87537932061.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/72225842688.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160e07d710c7f5---54657054036.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/b347beb3718e8566a02e2cd37b91abae/36360105212.pdfIn PDF document text
    • http://mysistermyfriendministries.org/clients/85776/File/61391607072.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16104852891460---88419659032.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/77322841825.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/nadubega.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_off0000bb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38C 15128 bytes
SHA-256: 1cf811804649990fd700e493c65c93396fd1301b80ac99dabffb838e55b66c5e
font_02_sfnt_off0000f8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E5 10380 bytes
SHA-256: b2efd88f54a96d3519c392415fe215c0eaed0aa062674b563ecf3ceae93eca62

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