Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d6f8cab18a5367f…

MALICIOUS

PDF

77.6 KB Created: 2021-08-03 09:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 12365769418304c147345b4f2919409b SHA-1: 894989abfcabca20082eae82000479d7e2955ee2 SHA-256: 3d6f8cab18a5367f8df7522f5aa29f6dc70ed031c715de4ac2e011cd467984fa
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute further malicious content. The presence of embedded JavaScript, though not directly executable in this context, indicates a potential for malicious scripting if the PDF were to be rendered in a vulnerable viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/5cu74uiua20epg0du7oa9gd7h5/9029075774.pdf In PDF document text
    • http://a-kamen.com/userfiles/file/wunezawilirobevi.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/gozuwojimapafexifuso.pdfIn PDF document text
    • https://talleresimad.com/images/subidas/files/goxomidu.pdfIn PDF document text
    • https://sapporopools.com/contents//files/53424754447.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/fuvegugozabafibufi.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/161010dfc85769---92492708169.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161068f62e822d---99997779451.pdfIn PDF document text
    • https://ivaco.it/file/dazorodonigadatazi.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/27087573052.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/d8r57tguq2mnqn0jfviqe3u676/98596023074.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/9e55d256eda75fd97a7f49f4cdff2e7e/budalilibuxukagomero.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/49747232806.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/fisamarugupofov.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/kalamod.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d925780af1d---dejosu.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822072d4294---nivisetojivemili.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/f4mvesn93b1v2bkepurf4fbnck/2298733270.pdfIn PDF document text
    • https://blokhol.com/upload/files/21362201916.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ffb78328f---32765461184.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/xepimivifil.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/voxewozekimadexusaruz.pdfIn PDF document text
    • https://tepihtrava.rs//files/85358552166.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/kenepusuderiles.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=escape+the+car+unblocked+games+76PDF 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_off0000ca6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE282 11404 bytes
SHA-256: 1fb35c19050bde4df5ff4a9dd52bb5f384e3133f4d52a6d75ae270734de31dff
font_02_sfnt_off0000fcd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD7 16896 bytes
SHA-256: 5ad8368cdb35550afc7b7ae5e1a037d4bc6496ff3aa664b1791863e1d73236ff

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