Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca1a1f6048f1accb…

MALICIOUS

PDF

79.8 KB Created: 2021-09-06 09:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 006e24fbc095037ef4702e698ed70c66 SHA-1: a474fd3703803288316cd0bb987d43694802ab6a SHA-256: ca1a1f6048f1accbaab6d9d332015f62144828729e95cb916886c0d56808ed85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external URIs and is flagged as a link farm, with many links pointing to compromised WordPress upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://ketchas.ru/uplcv?utm_term=head+first+c+book+pdf+free+download PDF link annotation
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161009c51860f2---91033728963.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c428577226---86886698115.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/fbe9af836d7685bf9a6db242a170e21f/59954859319.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/47628320726.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/4h3v13tvpfumeej1h9ntgqo6q9/49823991639.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d6bf5ab05---fubojeselaleto.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/nekerusijuguvovafubaxe.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/64489c95006601efe4bf8eca6611cc4a/julipubuxiwivexoku.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/52635012474.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/39e2adbb68b89624eaa5311ab5898322/15038842335.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c03ff61fdb1---42439875427.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/xatiletewupelusopi.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/vepukip.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/walezukegazujizumodupof.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd721aea64---menovotoxiluz.pdfIn PDF document text
    • https://31app.com/userfiles/file/xomabisuzefomusebifidegu.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/55779007168.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/lokegewojilumutiribavi.pdfIn PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/betoxuwutuvezefep.pdfIn PDF document text
    • http://marymo.ru/uploads/files/82684319760.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/64981592458.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/mpc43v83m9lbiu20dtnra73kq8/2135536911.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_off0000cf6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77C 18524 bytes
SHA-256: 19c38ee8cad2bd73293c545510b17dd2c8b2a2589d5851da9c50d3897cbc79a9
font_02_sfnt_off00011882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11882 10920 bytes
SHA-256: c83b93cfc597c8808244e4c88d25d4ff1732fded04947f443e78fd4383232799

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