Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba16ebd262665474…

MALICIOUS

PDF

120.9 KB Created: 2021-06-25 14:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b3b90d926fece50f76bf4d81bc5fc71 SHA-1: 316d4c688cb1078a9d2afc48062461e83308c28b SHA-256: ba16ebd262665474391982f14943d135c5202b8ac77e2723c8b6b17dcfb9f158
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The file's structure and embedded links suggest it's part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/j5ekbasv2bt5lnsmcbtfcro4u7/liret.pdf
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce0f885b75---jeluj.pdf
    • https://ancoraeducacion.com/images/6511331159.pdf
    • https://elegune.net/files/galeria/files/52515904950.pdf
    • http://ebsenglish.net/_UploadFile/Images/file/536881025.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6b10821cb---36504778518.pdf
    • https://xlspandoek.nl/userfiles/file/nububo.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b180a604855---bekapipulazovapiviso.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783b74f1383---27601453847.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/a492dc075c6d2ee379382ae3a877a009/zegamu.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/03plflfcpummsmn9k3fdloe6gp/pijovi.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/7fe13cc7cf600a0eb8698b90b36b3358/sokorokitovut.pdf
    • http://monktonlionsclubkidscamp.com/clients/9/99/99b8b5517e5fb663501b7ee5137ebf55/File/98103373387.pdf
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38719169514.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073242a75353---96079410704.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=bsc+computer+science+question+paper
    • 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_off000179f2.bin
d546e18a6e8597755c50e8034df57066d24c3fc28e94f5d3f2cb2071e565254b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x179F2 16236 bytes
font_01_sfnt_off0001a3f4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3F4 16792 bytes
font_02_sfnt_off0001bc0b.bin
3c90cefc9a87c19c460fcf44aa03f127c7751f5e0fad0613d6ebb5f8d5ee990c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC0B 10788 bytes

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