Malicious PDF — malware analysis report

Static analysis result for SHA-256 56f4a6414fb02a98…

MALICIOUS

PDF

78.3 KB Created: 2021-09-17 18:16:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9ca0348566ca63844d31ad80189a5384 SHA-1: a148cec51ce959d675793ce69aa59cc28d107fc9 SHA-256: 56f4a6414fb02a9858eb6a1c31bf6fe321ef9d9e3c3b63fd0f5790a3a61a089a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised WordPress installations, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded links are designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/3594f4008c8001402256790a5750fe49/62280059162.pdf In PDF document text
    • http://foxgraphics.paulsfashion.in/files/52445469631.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/nigafe.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/87433074230.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/i9vee3oug6hd3dv5thvt760jpc/65725040495.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/cff4cbed5a39e1a8c4677fccde7ebd40/15521958656.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5c81a6f81---zawiguduraviwupademosop.pdfIn PDF document text
    • https://hediyelikhanem.com/calisma2/files/uploads/sizelorizokikazelubosovi.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/jawaguzinuremerakok.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/9nl8gpdlu8r3jfkstglqtok7fr/bojuruwenipulesokutokuzi.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/kigofasetejofigukoxaz.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/72747993497.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/dafodetagabu.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/rukovozapesokilexepik.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/borunumewofesi.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/jojijujozowuba.pdfIn PDF document text
    • https://investkwik.com/userfiles/file/41774308284.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/nugute.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/u6ue4nht06npo63fhmtvoe6g6b/gibubotuwusexisuseju.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/0v5b09sbebnicp7qnfopr8vil5/menejiwesawagube.pdfIn PDF document text
    • http://carszana.com/image/upload/File/kumopipokedejivubebuvo.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/46421723754.pdfIn PDF document text
    • http://bio-scan.com/userfiles/file/49186130908.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/c934c41a3d1de15dbd371aa1d728464a/fixobufubiketoxawafizes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=best+app+to+download+tv+series+for+free+pcPDF 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_off0000cc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1C 17732 bytes
SHA-256: 6d122d2885e81ff0e94f0be1e1742c6e684eb592ea85baca11d0b260a8203505
font_01_sfnt_off0000f9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E9 10820 bytes
SHA-256: 9faddaa4bd7521e827bbf6203b7ed38b1f7233ed9126cd3dd9f70c65de220d3f