Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfc58723078a7954…

MALICIOUS

PDF

77.2 KB Created: 2021-09-17 02:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 04ecf6898634d92a8c45d33ca4ab429f SHA-1: 4a49ad5d40c07f60e71cc79070a4c1fa183142d6 SHA-256: bfc58723078a79541854f41668fc0f42ab79e0ac3e0374e7eda6312bb2dc0986
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

This PDF file contains embedded JavaScript and multiple links to external PDF files hosted on compromised WordPress sites, indicating a phishing lure. The heuristic 'SE_MFA_LURE' strongly suggests the document is designed to trick users into providing sensitive authentication information. The embedded JavaScript likely facilitates the redirection or presentation of the phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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 http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328aa89abce---86680331615.pdf In PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202196730511224.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/15571038601.pdfIn PDF document text
    • http://atsolution.org/userfiles/file/20210902134346135321044.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/36051548090.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/16742093042.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/433204919.pdfIn PDF document text
    • https://sinaia-vik.com/admin/fckeditor/editor/filemanager/connectors/php/file/vubopuri.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/76113971487.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/jagukoguvumozokolinegi.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613646bf224a6---7059953424.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/31165497146.pdfIn PDF document text
    • http://namngonviet.com/user-/files/4180511357.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4e3ac0043---81136326516.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/dopazinewiparimunemiluxa.pdfIn PDF document text
    • http://saraswatishikshamandir.com/singhania/downloads/file/55663364054.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/87143419576.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/kunifodowisufugoter.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/3311febede94875a83dacf57483ace4f/14172264848.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/roluvovazopavosadoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=migrating+from+android+to+iphone+7PDF 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_off0000c974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC974 17692 bytes
SHA-256: c0121978e72e67cbb5233ff97664f2466bac104231843d93a499f4bdaa675163
font_01_sfnt_off0000f755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF755 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6C 10772 bytes
SHA-256: 987e546a579ab9cb6eee9cac86f79136e71a20dd8919e410b578944b23575e9c

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