Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9f645f44481d558…

MALICIOUS

PDF

87.9 KB Created: 2021-07-23 01:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 444fc5b84066bce7486d48089284dcd1 SHA-1: 6527683b8d93959eaf9f905e1ede9604db73e290 SHA-256: f9f645f44481d5586aaac7e3b54aa2b761015f394f017979b83d70b97f71942f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to compromised CMS upload storage and disposable hosting, suggesting it's a link farm designed to redirect users to malicious sites. The primary purpose appears to be directing users to potentially compromised or malicious web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd45571ba7---15158856300.pdf In PDF document text
    • https://marblobath.com/app/webroot/img/files/palowafuxagewemivepog.pdfIn PDF document text
    • https://teyadegitimvideo.com/calisma2/files/uploads/39031359644.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/ca44d5445de794471b65b2d5dc1bc370/4996816059.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/tejutodutubikow.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b56f919c3ab---9242907194.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f9c44e8b1---femojoni.pdfIn PDF document text
    • https://mashura.co/userfiles/files/64020926681.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609143d1e6577---563503634.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/678170f5b16e4a73b6b251180a4b656a/kenol.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b65965daa2---81985390157.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/35978572172.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc9357797e---29991309969.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/bexamudemeluwezaf.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/vazedep.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/726addb5e66446177d5c5feb46a0dab5/27654142059.pdfIn PDF document text
    • http://atek-ent.com/upload/file/rikoritetiwuvedabax.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/6f04a6423947d7ef4c00fb4b9b699f9a/guliru.pdfIn PDF document text
    • https://fasaac.org/temp//files/wurezubapevakelifone.pdfIn PDF document text
    • https://heider.ru/wp-content/plugins/super-forms/uploads/php/files/6840683b468c0cf159333a79ee212015/walulubomamixafozubo.pdfIn PDF document text
    • http://patroha.hu/file/66803016383.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/7207ef3a6efe141abcc2fa9b24e28193/xatiminobikobabipurul.pdfIn PDF document text
    • https://latework.cz/soubory/nelasadimusizunu.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608120389ce66---98890483322.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/denivafuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=state+plane+zone+mapPDF 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_off0000f544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF544 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5B 10188 bytes
SHA-256: 3c213926bbd701629418f506af69751c10f4a94647bb73b6187e147652cdb282
font_02_sfnt_off0001242f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242F 17496 bytes
SHA-256: 9876c372714000f26956d5f49e90216458c55f07b02040fcc377863a6f4b3f34