Malicious PDF — malware analysis report

Static analysis result for SHA-256 c95d6c1ee615f1af…

MALICIOUS

PDF

75.7 KB Created: 2021-09-12 05:04:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 015d7aa23492a1be443c36105799ea3d SHA-1: 264ebc3d9b80a6f695a2643ee809d0c0ad359b61 SHA-256: c95d6c1ee615f1af1accfb7b5dc3ec2ca6571909e0779246466631b9a62ed2a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://bhiringisamsankalimandir.org/ckfinder/userfiles/files/45285414795.pdf In PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136b6d38cf35---butupobasoxozisanuwu.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/11290834993.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/55629146454.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/lowuzurul.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/mokizus.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/bevifudedonevosoz.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/14145130666.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/1026eb1c3821f2b210073ef7ec98acc6/dowodidas.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/veroxolijewaxaluwilikebo.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/ramefuvuzatu.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613738d67c34e---nebavofunipawikidawukazod.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/40049569297.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/78016191843.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/11979272449.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/kivatixedet.pdfIn PDF document text
    • http://coconut.hu/userfiles/file/85444591064.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/80027555272.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/difijo.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135cf7676285---fejaxoteligakufakibo.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/19431363073.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/rokuror.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/vutov.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131bc3f0dfa4---99549841547.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a5a65595e---75725460426.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109040936212940.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=hex+to+decimal+in+excelPDF 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_off0000c454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC454 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC66 17268 bytes
SHA-256: 19a2289086929d68fcd9ea0a6c90d36a961ff4c8c2836f6987d809b8642bf8cb
font_02_sfnt_off000109b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B2 10356 bytes
SHA-256: 5a0f23b729bf3f96483d10a9eb32d691f917b267c4ef02f4503d699fb43080fd