Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c749e6c9b62db4a…

MALICIOUS

PDF

86.5 KB Created: 2021-08-24 23:08:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1a6c595a9320c91650e5c5bad4e15256 SHA-1: 5e009a7f5b352259801e0fe2b48f92730ca6f51c SHA-256: 6c749e6c9b62db4a6ca9c72c946991322316cc601989cd12ff7831018a092537
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/b2f42937f0134f3f01031d470375f2d1/34521978908.pdf In PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/7deba25c2ff5415fe504744c4c88b0a9/zubuwepadu.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608009fd0082f---bozafefonogeb.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef051beb97---26896661198.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/42296682278.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b176cf3f255---94097766199.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/69433426107.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/1mu25b7ho7687t4dp86q6rl4sf/wirufanoja.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8e9476b11---pujudes.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e2a4353e---51142127996.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/texojerojakegufomebasup.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/96427742496.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/jurenotubaj.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/b289ab255ffc5dee7391ea4f770fca0d/637528710.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/k4edbfno4e5alntor2avtmo455/deriti.pdfIn PDF document text
    • https://camphacement.vn/upload/files/kowutujuxewakadopewomu.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749ba59645e---24064515713.pdfIn PDF document text
    • https://flyfinz.com/userfiles/files/55131441270.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/6760163780.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/bekokalubi.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/36672324364.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/5eb84a0e6a6f5656ce5f2fd045298167/43224546687.pdfIn PDF document text
    • http://minutemen-jrotc.com/clients/84940/File/murigukudaletito.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/89364040040.pdfIn PDF document text
    • https://ahha.az/userfiles/file/85243767439.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=fermentation+does+not+produce+atpPDF 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_off0000efc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC4 10708 bytes
SHA-256: 74f0d97e9e30d4d235cdcb53f754ed85f2364b68da69c6d636ef959be024842b
font_01_sfnt_off0001084b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084B 16828 bytes
SHA-256: 94ad4518aa04215d554c9848398caafba21dc98bff90edf660cb1926d6bce3c3
font_02_sfnt_off00013442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13442 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1