Malicious PDF — malware analysis report

Static analysis result for SHA-256 65c704984bb33eee…

MALICIOUS

PDF

71.4 KB Created: 2021-09-26 21:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 53f4109967a36f939c47e47e406a50c1 SHA-1: e147d89ae99e5503c56cc9ce8e6c4ac4a125f799 SHA-256: 65c704984bb33eee60594a22def770e4bd532e4c56f3f3ce197083063514cb77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing lure, potentially leading to the download of further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://infrive.ru/uplcv?utm_term=download+arabic+keyboard+apk PDF link annotation
    • https://clinicscrm.com/img/files/53512809714.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/voxamorizimifoziwelimoben.pdfIn PDF document text
    • http://esangsok.com/upfile/files/30025066739.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021092400334397.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210902_023FC591B0272F16.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/rufilevarabezi.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/sejebatukefabemojex.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/78870353191.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/60915423438.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/53901553987.pdfIn PDF document text
    • http://12shio5.com/contents/files/xuwajibepuv.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfc992ecd5---bewutowinuleliwejak.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/66989415511.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/vavinamamawipokezovofusik.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/zagawokugat.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/lemunorenuxabita.pdfIn PDF document text
    • https://keongracun.org/contents/files/59764004590.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/47361010899.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f435767669---xozapupofalo.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/1f7cb297df5e47b7aa4e2e972cdc3e93/jaxukukibakijogukiniwik.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/tebinofeberawabegado.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/kejovezamaza.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/januzotolubabagonakim.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_off0000b24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB24D 10672 bytes
SHA-256: 04097c4dd315c2d9101f7e9f1355078c9e87970d6640606cf7f774981f2f06aa
font_01_sfnt_off0000caa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA4 17904 bytes
SHA-256: ac51cc74bcd0debde01aa01a0f6cf7ef6f21497b115c5b16be52efcbb83e3611
font_02_sfnt_off0000f845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF845 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1