Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec5d356918c7d5ed…

MALICIOUS

PDF

77.6 KB Created: 2021-08-28 07:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0e850042ac3d104469da72219148cd71 SHA-1: b82460f9d9eb0e66a7d18c359b983d2de5bb53b2 SHA-256: ec5d356918c7d5ed57da0877199653409a3c9cac4f89744e1520b2f526a917c8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that form a link farm, directing users to various websites, some of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the extensive use of external links points to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://irlanc.ru/uplcv?utm_term=meditation+for+finding+answers PDF link annotation
    • http://cambodiadriverservice.com/userfiles/file/79882425864.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/bewarifasimugetepi.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/2fc8117f89f0e04fa917fcef0b585328/wogisemuxezeduvekazog.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/62356495973.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/10343099623.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16084f7cde63f0---77154100797.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d3da84d096c---44880240317.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/fidapuzukenovu.pdfIn PDF document text
    • http://alkanboya.com/files/file///70809802705.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/16661472805.pdfIn PDF document text
    • http://akssert.com/userfiles/files/66591300787.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/d39aaffc34966514af2051e30c55874f/sozenobojewip.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/59933320796.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087d6cd9e08d---jopuz.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/50274657510.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f06ffb9857c---larenujuke.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/e7j7okvjsg22sru46an0ke5j75/xenijuwefijen.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ac96ab2f370---jokajurededonitejadutenew.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd5391c8f1f---69832655390.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/2a67eec861c68c70c4ea514af7337d0f/siwetuwiju.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/94097178604.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609455fe16ce2---nasukekilugeridanibonovaj.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/21324193215.pdfIn PDF document text
    • 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_off0000cb05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB05 10560 bytes
SHA-256: a20b8bf6a01d4cd5306f4dd1d5a179c26b343a913fccc8dc788642e19f7dbecf
font_01_sfnt_off0000e314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE314 17920 bytes
SHA-256: fb86b4d7e09fc6a9ddbb9a2f60a1075b1ecd84613b0526af908d7beb27e3cc9a
font_02_sfnt_off000110ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1