Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d4939ed9e2803e…

MALICIOUS

PDF

68.8 KB Created: 2021-09-24 17:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b1a2e7a028390f00e331adbe03ec8407 SHA-1: d91b495487f669713c4846829cb84ff9fa1e28e3 SHA-256: 88d4939ed9e2803efc5fff47ff666173d2c6d2cf9cc7ffac4b944601c10c47c4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://cructi.ru/uplcv?utm_term=watch+trolls+online+putlocker PDF link annotation
    • https://bimore.vn/webroot/img/files/ginefaxerufesumeloseb.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613766d15c144---vuxokigul.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/6961207615.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/wilabofuwupizat.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/gepugafizejitafamamitow.pdfIn PDF document text
    • https://tranthachcaodanang.thicongmaiche.com/uploads/image/files/xuzebafolokowigivati.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16146d25620bb3---rowujubevivirasifalute.pdfIn PDF document text
    • https://sthouseluxury.com/upload/files/75239093692.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/ledixezetitukivixim.pdfIn PDF document text
    • http://irths.com/upload_files/files/52356687870.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614ba4f049400---kebapex.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/31613443444.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/foledu.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b3e570ac91---90321680248.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/45171168332.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/gepulubokewukusa.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344c0fdbe4e---67330837277.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/tivabijumodawanav.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/ruveg.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/buwak.pdfIn PDF document text
    • https://emenu.hu/editor_up/falosubumotarafubirifova.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/2115476510.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/70797519739.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/vosesinowowarumofog.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_off0000af4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75F 14720 bytes
SHA-256: 2933145b9b7f5440ade28741f6dac7aaf1fe63932d3596c08baa44e20d3896a0
font_02_sfnt_off0000ebe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE1 10656 bytes
SHA-256: 2d0a05d902b89ce028bf0a5ac795a39a21ca14ae941de685c125237c62ac65fe

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