Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e3e413d6daae94c…

MALICIOUS

PDF

86.9 KB Created: 2021-07-13 04:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 744ae6f48e28869ddc3c8d71a495c09d SHA-1: e8069a24ce8ffb833b2dd58705f1b832ef3010c8 SHA-256: 4e3e413d6daae94c44d363f5efa340209dfc3ce2b3c9647d8b5c7b321809b410
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.mustwalge.ee/data/content/files/mudizilabupinapa.pdf
    • https://ka-base.no/images_content/file/vejamutovogufokorexo.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074967276d42---50843530371.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/m0n7etp5g0ot8v24u5mv52th00/75776227562.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/8d77hsrq0ggdjj8udcrpeje75s/kodegozok.pdf
    • https://likeevent.it/writable/public/userfiles/file/voxozosanop.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b006bccf91a---41347879548.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160984603e4b13---21691353450.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608367f26e1ff---62536723070.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/63a95157a4c7f85846629cb94840e069/jasupejoto.pdf
    • https://dichocungtoi.com/userfiles/file/67535145046.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894cc8f2236---95109808036.pdf
    • http://powerfalcon.net/uppic/files/kamubapivisaxuzi.pdf
    • http://akinmedical.com/uploads/file/ferakoku.pdf
    • https://darkoyunpin.com/calisma2/files/uploads/jixosawutopemuteketiw.pdf
    • http://giadinhlaurenso.org/upload/files/96226855569.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/g71c338t8854utk64161is97a3/74230283606.pdf
    • https://securityguardsupply.org/php/uploads/file/66113385271.pdf
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084fb525fa8c---lonen.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/45468704fb5469867468c05959a9f9bd/mokax.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/d5dc90077366de9753925a06269fcade/bavuxetesitakesoburuvafem.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/6s9f8acfuktnb1u3h83po9ji6l/xodemukilovu.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798d28a08a2---79369581407.pdf
    • http://ccapostolicchurch.org/clients/1/19/19d200bce63520a637954fb60b162b1a/File/44682634181.pdf
    • http://erex.hu/upload/file/37635356137.pdf
    • https://roweryelectra.pl/app/webroot/uploads/file/16260987374392.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=to+your+satisfaction+synonym
    • 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_off0000eff9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF9 16792 bytes
font_01_sfnt_off00010810.bin
bdb2c5a4ca1a529ff4911bee0ffb49969137bd821fa93f8bb7fc228540a44121
pdf-font-stream PDF embedded font (sfnt) at offset 0x10810 10496 bytes
font_02_sfnt_off00011ffd.bin
8e815f7f09ae6e66c85210bd2bab9a99b0498aecf1b829cb59bf703b65bd6533
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFD 17556 bytes