Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb2ab2ade3e0b20f…

MALICIOUS

PDF

93.4 KB Created: 2021-06-25 20:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5db6532771c3bd466eb8c63a9d1a33b5 SHA-1: b76831adfe13438d73af2f16321fc9e183e31b17 SHA-256: bb2ab2ade3e0b20fbe56db7e01eeb4627ad252b79c925a4481ccfba3020eeef0
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised CMS upload directories, suggesting it's designed to redirect users to malicious sites. The presence of multiple unknown URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1744a0c0c---96637258726.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/slr04s06s7jk6027tl92j0oh1o/burixaromuwumozoligotebos.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3000e91c8---jopazavukorazumipegokuzu.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/b0f6e003a2db71cbd09809110c2419e4/99185444879.pdf
    • https://rkdestate.com/userfiles/file/19643736394.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160724f4b9a56c---judemenatokutu.pdf
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/1c52da7fbf5ddd48d9e19da213c3f33f/20552400962.pdf
    • http://kompletucetnictvi.cz/files/file/2581055397.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/0hqknqs4l1d57ji4bh0u95cvr0/17978867682.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16085c9c96c69c---dolapaxob.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/a9966c48893ace931e4438b15940d39e/98937300811.pdf
    • https://larrialdiak.es/files/galeria/files/vugabokinejarovavowuxofe.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/l3foglk2gcrf1kqqmvlc1u30f5/23490611057.pdf
    • https://afayl.com/userfiles/file/doforebezonurikaweb.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/39082edd03456333159405c851d950db/tizawezanurexopu.pdf
    • http://anhuizhkj.com/upload_fck/file/2021-5-7/20210507153502659453.pdf
    • https://ratco-hardware.com/Ups/files/55138239883.pdf
    • https://bistakalikotenetwork.com/userfiles/file/zawaboludukurusedama.pdf
    • http://danieldesignpro.com/userfiles/92654228691.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/dd5c95e4d608e108f6831b80e968df73/56163687425.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/94359666300596d6ca010586d9f9ef65/23270992619.pdf
    • http://studiorinaldibedin.eu/userfiles/files/14517157374.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=translate+pdf+from+english+to+spanish+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_off00010a60.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A60 16792 bytes
font_01_sfnt_off00012277.bin
4ce222e718365bdd278f63449f0b6af43648119458181918758de58db89b714b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12277 10908 bytes
font_02_sfnt_off00013b40.bin
326cae160c50c42c2e95cae942117e0a9dfb8246963c43d7f8e8b662ad965f0f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B40 17296 bytes