Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5c61a73299824f1…

MALICIOUS

PDF

88.6 KB Created: 2021-07-02 08:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a6e15d2531493e68fad3656412c4fef4 SHA-1: dd0d9449b6f8d98189bc93ab771535d10fe3298c SHA-256: d5c61a73299824f1e9ebca8bfb84421098f7cbea40e8a2433e280948ff6dae3c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting further PDF files. Heuristics indicate this is a link farm on disposable hosting, and ClamAV detected it as Pdf.Phishing.Trojan. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring users to click links that likely lead to phishing attempts or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/76afca13a5370b9e29dff5506f95814e/runuwilutenib.pdf In PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cdf55c2a72b---fezovuk.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/401c88ac30374c4a03c7d925793b38be/11482841913.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728d5b6c5a5---mokewarosarono.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160824f078a3fb---7097906416.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/f9125e79016f9ba321ef96328afe6b0f/87755386075.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cf22b93a6---nerijonojijefuwizakev.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/98169757374.pdfIn PDF document text
    • http://fairmonteast1975.com/clients/0/01/014dde3c838f86fef2ac1d31a86c415b/File/12994044744.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/t8639fp4o1b6554dtt0ud1g373/gilafupoduja.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/tokujin.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797cdd8d194---kidekumefana.pdfIn PDF document text
    • http://tulga.ru/editor/files/xadidajokulewiwowitanalo.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/36b1c476a2e4c9e8f990c29affd5f13e/89141724508.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/2021551010399492.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d04426412a---49807317825.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cea00109099---28168677983.pdfIn PDF document text
    • http://wf515345.tw/CKEdit/upload/files/fewigetesenobonemunimiso.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/nivavubepeto.pdfIn PDF document text
    • https://starwebline.com/calisma2/files/uploads/34202054720.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/ludeponinesomobuzuge.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/4018238190254668b30f91986019c814/guwapuromunuko.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/e178be662fcba01db1305390d83c0f6f/85991583175.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/mebemozogixakujibazoxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=solution+of+examples+of+indeterminate+beams+by+force+methodPDF 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_off0000f68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68F 16596 bytes
SHA-256: c57f368d957ab5678885e95f40ea74c47c8dfa63ab430c5592464f86b6e4eefb
font_01_sfnt_off0001221f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A36 11416 bytes
SHA-256: 0ff09cde2cc10f921fcb1d8d2b328cc27ceb0dfd454ced9eb88e97527fce59d8

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