Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f1e24d473f85725…

MALICIOUS

PDF

86.2 KB Created: 2021-07-21 02:24:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ddc0359bcef6ff132b09cbe0c66493b1 SHA-1: 453349bdc939d4dc13d901b7ff599c3fc2d9825e SHA-256: 5f1e24d473f85725bf761d33c6ced61824bd72cc099e29fb72e7a97edd92316e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads or redirect users to malicious sites.

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 https://duext.com/wp-content/plugins/super-forms/uploads/php/files/113240c06966581d8db85c6fd65cc34a/83015185923.pdf
    • http://ankurgroups.com/userfiles/file/40231589228.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083f786e2d85---divogapimude.pdf
    • http://barcelonasixtytwo.com/userfiles/file/66809667928.pdf
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/lawarotixifewama.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e169ecd53d---64484319085.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fc01b3391---kovelisibobewonalexelan.pdf
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/60925393146.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b55393b8a---55464116808.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e0423e498e6---nazumololumanikalu.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/903q3qat5npv2qgs12dttje8s2/19733415447.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/7d98b91bc8fbf7b45e3cd725edc79ef1/14051315071.pdf
    • http://imssp.by/data/images/fxeditor/file/fibapinew.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/24beda965a5f8d621eac91938eb78bce/42249229907.pdf
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/30a84ffd1dae1eb5db9665f592de8038/28453135844.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/8brbu2q1pn4cpqf10896jb4197/12888372093.pdf
    • https://mertlakustika.cz/images/pages/file/xugova.pdf
    • https://actaviaserica.org/board/file/files/5640494438.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bd1747031---kewomirova.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a612f42ef10---bewipewipaxugagazarefoj.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/883e8d330f3113c0453cec3a3b18233d/perowaliba.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160709b21887ad---77050277258.pdf
    • http://dalboncostruzioni.it/userfiles/files/kepuwokefagogovudu.pdf
    • https://triptoboloyfoundation.org/editorsfiles/files/48041201300.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=accounting+and+finance+research+pdf
    • 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_off0000eb2e.bin
69aaa99af1e65aef7dc873678109228f5e316f4e4afc5c35e67cff1e79038b92
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2E 17844 bytes
font_01_sfnt_off000119f3.bin
c8063c6bb17c462f898d7b0d8d7beea27c9fabf14c756c0bab55356992059b03
pdf-font-stream PDF embedded font (sfnt) at offset 0x119F3 10936 bytes
font_02_sfnt_off00013320.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13320 16792 bytes