Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f0a47478eeb4dd…

MALICIOUS

PDF

80.2 KB Created: 2021-08-13 20:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0441593817abc11de51106baa1d0f85b SHA-1: cf74aadcd1837d7ffd7ab5be44747d19b92a92d6 SHA-256: b4f0a47478eeb4dd72eb03536e9353506293e6be86cdddd1cfa17c0c497adece
172 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to execute malicious code or redirect users. The presence of numerous external URIs, many hosted on potentially compromised CMS platforms or disposable hosting, suggests a link farm designed to funnel victims to malicious sites. The 'SE_DOWNLOAD_BUTTON' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mamo-tato.ro/userfiles/file/784529274.pdf In PDF document text
    • https://bednidhitraders.com/userfiles/file/38592074725.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/vtnvirvmlccmselpp9dmncqk70/64410901742.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5779c7f371---wadovodujipe.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/99a7c88a81f51c4aaedaa1b39bb986b5/53149004720.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfc4396e1e6---96609536031.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de3445d7ccd---zugak.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/59348827650.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210723124807566630nhautb.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093c5069e46d---48104750346.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/23949189668.pdfIn PDF document text
    • http://nessium.net/userfiles/file/59135488263.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/d17lgmmilm8nsh52t0laq150hg/maxawipevibod.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/70d845d9bd85543a6f8ace646193fe8c/73744704685.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/dopigonoxovudevigamive.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/nivomum.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/d8piucreiodt5lv5ohoccl2cat/buxugokabebugeb.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/nuzuga.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/37986395193.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/5c4ba7db0335d24495841d4ebc820531/10968174610.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b54ce2c6eb0---godete.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/ravimifiz.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/a0eebf319eded7b2319617f55afd78bb/65151528105.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/bubetabupaleviri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=bajirao+mastani+full+movie+online+hd+free+downloadPDF 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_off0000d1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EA 17308 bytes
SHA-256: a3c5d02f71f7e8146aaa5ddef0f2f232b8b6a652a46723938ed5d29d4a5aebf2
font_01_sfnt_off0000ff31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF31 11056 bytes
SHA-256: 61def49210e6e2d9f6f68579d833f2fbbcf81127b3df4b36d8aab5fee6088ace
font_02_sfnt_off000118c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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