Malicious PDF — malware analysis report

Static analysis result for SHA-256 481af236ffb25798…

MALICIOUS

PDF

80.9 KB Created: 2021-09-12 13:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: cc20a340d8a6171d6ee1292ba42dda92 SHA-1: 17dfb63bb5d61ff4a9e908921e6eaaf28d39b4af SHA-256: 481af236ffb257985b88d8ccf0eb0d6b137ee9b4d41e531c58b99b1b0d139883
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains a link farm pointing to multiple PDF files hosted on compromised WordPress sites and other disposable domains, indicating a phishing or malware distribution attempt. The document body is unreadable, but the presence of numerous external links suggests a lure to external malicious content.

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://clinicaveterinariacittadivignola.com/userfiles/files/16856991680.pdf In PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3f55d6d0c---powogibujadeporanunisal.pdfIn PDF document text
    • https://insp.biz/img/file/82653106652.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/1t47pm8gb1vsgjmmtik9fh62a2/50980814722.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b094a8b27---53795282721.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/4594513899.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210906121748.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/84946350372.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/xujemajexejaxisev.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/56469250137.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/78118928411.pdfIn PDF document text
    • http://distant-property.ru/fck_editor_files/files/sikejepigikozap.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360ed2bc48d---namofixuva.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/jimezibavaximifiwe.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/nufinezubinejojawi.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/vikegukodade.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/nafop.pdfIn PDF document text
    • http://c-six.it/userfiles/files/mepojekejiwifo.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/74246599764.pdfIn PDF document text
    • https://interconformity.ro/images/file/jupilonopubujiw.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/raxilozemitobov.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/24074174294.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/53416286250.pdfIn PDF document text
    • https://amgaa.org/temp/files/5667384630.pdfIn PDF document text
    • http://olympusflights.com/files/files/39518535770.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=superpowered+latency+testPDF 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_off0000d8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B6 10788 bytes
SHA-256: f62db6bc463f7157d8f24e2bde7d138102fd04266ac428484714b08de4b42ead
font_01_sfnt_off0000f1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DC 17012 bytes
SHA-256: bbcf48a096f9b2d355f9712a30013165f12a972326b17e19c47213144ea80611

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