Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a93b756968cd6b…

MALICIOUS

PDF

96.7 KB Created: 2021-08-07 03:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 12d0098b3fd55048c319b587cf444ab5 SHA-1: 51f6ec29d88973048a06948c4f3fe4f35ed7bc18 SHA-256: 89a93b756968cd6b406a970696e82574491c739a8d6352ace7847c0f69950fad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

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 http://elfuklid.cz/foto/Image/file/vazije.pdf In PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/pexofotesaworawiwitevajos.pdfIn PDF document text
    • https://atl-50.com/files/file/89036475764.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/rizaxu.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084934320610---nepom.pdfIn PDF document text
    • http://canvangdientu.com/images/file/24211932967.pdfIn PDF document text
    • http://usdcp.jp/user_data/userfiles/files/disisefojuxagoka.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bb9c339c7---falad.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/f86b558fac3740701fc2d28a3e5af1ad/tototomubuto.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/2a280bab3db5aef61d1e28cae61b1289/letis.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbb8c24d83---96142146540.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nuderafofitukigu.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/kexuxowenuni.pdfIn PDF document text
    • http://candientuvibra.com/images/file/guzelebonizabo.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0ec015ec1069ec6143d82a1320408290/36541570823.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/13197807478.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/nufixunoledobejidina.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2a949ad9c---65337200120.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/69076387571.pdfIn PDF document text
    • http://photou.cc//ckfinder/userfiles/files/mabazefitivafadeja.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/powoxatozefegisofodumalor.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/fotorixoxipefa.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/18123037544.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/6749810933.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=gb+whatsapp+pro+version+9PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12377 18160 bytes
SHA-256: 362c8bb76580f77e43bed784e2503f56d12dc0299f67a084950cd2a65ae063f7
font_02_sfnt_off000151d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151D3 10800 bytes
SHA-256: 62d5da26f0b89b22e8b83afdda599dd3610b83133ced4ebeb35ce05c77d4e7e7
font_03_sfnt_off00016a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A91 1760 bytes
SHA-256: 478d64aad58a46c60a63c2bd6d05d9c39068b35528f549688063ac651822ff24

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