Malicious PDF — malware analysis report

Static analysis result for SHA-256 b248e9bfdc871758…

MALICIOUS

PDF

93.0 KB Created: 2021-08-22 15:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b63fc99729910bd207e3a5e5213b59a0 SHA-1: ec2fab99eca84e11cbe017cb922e13506894c94a SHA-256: b248e9bfdc8717585d1f4383259b13f344b5c603716d22b1dbe80acb4ab5c555
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also features a link farm pointing to compromised WordPress sites and other external URLs, suggesting an attempt to redirect users to malicious or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • 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://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/59e6e7a052e0982d325337b9aaabb637/12203571011.pdf In PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/48663799273.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d0cb982d649---semulawipudijuw.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder//userfiles/files/fumavekem.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160790a7e239e8---23062275254.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2930bfc0f---xivesatutirudinolige.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///49439685360.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/016fc64de377a7cb33555d6770917938/9681201892.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba09bd6fcea---52242914171.pdfIn PDF document text
    • http://palami.by/images/file/gosibutibom.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/fakunedasadobofifebegakin.pdfIn PDF document text
    • http://pvvc.cz/files/45301945814.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/17772628805.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/hvo59kqs0q0c1c75v6j278nt74/28579252228.pdfIn PDF document text
    • http://salt17.com/userfiles/files/givuzugosufo.pdfIn PDF document text
    • http://thaide.org/userfiles/file/80549863555.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/ouom5m5nb5iopoeth7ii4v107f/jelusi.pdfIn PDF document text
    • https://xigmatek.com/upload/files/xudexavugawesefeweduzuxe.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f24b650996---42206837680.pdfIn PDF document text
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/45554911712.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/98863776281.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b908bd736b---nimizaredivopoxazo.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/45610479808.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/dasemovorilatel.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5d68c9c16---87586049079.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/47694538004.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+check+death+certificate+status+telanganaPDF 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_off000108e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E5 11024 bytes
SHA-256: 358352c8e1e7a7958ea3a7b858175483738f4d9765b3d408f3d0998cde34eed9
font_01_sfnt_off00012249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12249 16768 bytes
SHA-256: 34cf957b2ede69a30189da478185f17eddeb7bc23cfdeceb8ff2143055e7265b
font_02_sfnt_off00014dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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