Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9456ef9203e645d…

MALICIOUS

PDF

90.9 KB Created: 2021-08-06 13:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2ecf0ee0d740225cf95051578b285788 SHA-1: 291b970d0ffbcc10bea3c3709be6cfe88eac76e7 SHA-256: d9456ef9203e645dd404bdd94cad72df57edef23e15dd60e56a7319800a69ac0
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress upload directories and other potentially untrusted domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The file's structure and embedded URLs suggest it's part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3eb85ea774---49676717328.pdf In PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab62ea7b025---20142343156.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49737746671.pdfIn PDF document text
    • http://hill-macktribe.com/clients/7/78/785e88641dcef8d5cadf71fa969cae92/File/45803415483.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/6f26mp69do483m4u8bl8e2grej/fezovax.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/xozenazotavo.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/jemexexapibarimodekofa.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/86210173624.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/92074160390.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/48996512932.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/2e671d08dd504c6126549562c55334be/rikogewofosomazodotowaruw.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/83309626828.pdfIn PDF document text
    • http://exima.kr/userData/board/file/31353483896.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/porajov.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/lebutepiju.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44505045191.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23223962908.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/36186805094.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/8s1l9ji8g2rjjucl5417of7ug6/4185527721.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/muribiwijerukotenoda.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/77119461634.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/5c81b7a14ab19cb9d5c73e6c2b5f6f70/2535375100.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/13187244936.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/32692546304.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/65885942024.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=gramatica+en+espanol+para+ni%C3%B1os+pdf+free+downloadPDF 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_off0000f643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF643 19756 bytes
SHA-256: c2a183cce260081211ba8c187a2cdc6daa82522e7e6393bff613bed0c65679b7
font_01_sfnt_off0001294d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294D 11112 bytes
SHA-256: c3927f3728af37384bca477fcb7f91bdb1a2079d9bcef47c70865a40a5e40cb8
font_02_sfnt_off00014312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14312 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1