Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d9032be217bf6e1…

MALICIOUS

PDF

99.4 KB Created: 2021-06-28 06:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a026454b225cf50512a654fbab4ebd2 SHA-1: 9e26047477bbb1a4559d220e1c335397d44b764e SHA-256: 1d9032be217bf6e1bea333417366dfcfafc8eb534b17b41a561e9fdbf0ec41b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/dg2bo3mdq92gfbi0aca6scer63/pawabadutopubefevomofaf.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081716620eae---fatudofe.pdf
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/3757fbff88388c0b6daa3da6e781b889/78251211070.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091aafb8c26c---78097194338.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/dhap1ho7f1f1qcjrhlg35oemuv/gisomixekezaza.pdf
    • http://serdceprirody.ru/userfiles/file/tunuwetejutiziwugomav.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1dbd2b614d---guzitif.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/d1b18131ccfc5557fabe955cd7429392/11811660086.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/77ceivskv0v4recmc359gdq1ve/jubepajakafewikapa.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0b55af068---73102939139.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078924e21074---73124896821.pdf
    • http://dok-vo.ru/userfiles/file/sagozonikil.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/7g25j46ue7ddtdpl0cv4t0da3q/biwijasaxamaw.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/l9a9l15c05ujgdk6btilsbs5v3/1546666901.pdf
    • https://zweefvlieg.net/userfiles/file/85730799108.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/413426c87b7280109613891f42627821/lutararadudidazu.pdf
    • http://cpghollywood.com/userfiles/files/bevezifozunuzugewexa.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d58b9be1b4---22975459465.pdf
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/21709181009.pdf
    • https://infiniteprospects.com/FCKeditor/file/48143014776.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce5a045544---mokekal.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/28d90b9fcb6c176a46a086c58d5d4c13/dulojopuvijizaz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=simon+and+schuster+handbook+for+writers+pdf+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001200b.bin
4912379e50cf6181f03b71dc11d38fe095e3b0303a1049530ee6a83aa7f42da1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1200B 11332 bytes
font_01_sfnt_off00013a55.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A55 16792 bytes
font_02_sfnt_off00015267.bin
07d9bf6f5f1f183b5b2a05006acbb90f96ef3d9c9038e5abf664b8b1d19fe7d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x15267 17540 bytes