Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c64b02c7c8422fe…

MALICIOUS

PDF

76.8 KB Created: 2021-09-10 19:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f68ab7778960363e3fe51d8e98ea7e7e SHA-1: c290cb93097871a5dfffc57132eb9240aabd1470 SHA-256: 8c64b02c7c8422fe27b6c1f7e8daf19008ff064c08531389e6b7234a58367f6c
156 Risk Score

Malware Insights

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

The PDF file contains a link farm, with many URLs pointing to external resources. Several heuristics indicate that these links are non-clustered and hosted on disposable or compromised domains, including a compromised WordPress upload. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://protradingindia.net/userfiles/file/3269725315.pdf In PDF document text
    • https://skinrepublic.vn/webroot/img/files/piwodona.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/faguwapudepitopuvi.pdfIn PDF document text
    • http://potya.com/walonez.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/figukawomonif.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/uqo2for69k534f53vt7jkp0i1q/wajasasafidegalex.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/duxasunisalir.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/3242d5f68d8524131b5f9049ab749d3d/zesidotisoz.pdfIn PDF document text
    • https://ourguarantees.com/userfiles/file/zabamagisu.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/f0d138abb3f11b6017303fcd07f95d18/90122753351.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138d906ad1d7---31206880787.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/lulepujivikotefefokabara.pdfIn PDF document text
    • http://mobil-tech.com/files/6308836504.pdfIn PDF document text
    • http://fedime.org/imagenes/77518964973.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/gosimuxulomuvunamexo.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/85262226840.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/8661816472.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/muvulu.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/9550854093.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/6742624486.pdfIn PDF document text
    • http://safetruck.gr/images/file/megamigezasef.pdfIn PDF document text
    • http://cudicio.it/images/file/33114513447.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/32796665211.pdfIn PDF document text
    • http://z500.si/files/8496999250.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=phone+to+pc+backupPDF 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_off0000c84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC84E 17876 bytes
SHA-256: fa1b1720877026c92005f1c62c72d2de581ef196233a1712b94890fe2745d696
font_01_sfnt_off0000f62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E41 10400 bytes
SHA-256: 78f2ac32cb420fb46d7850e6508a10a06c9a93cd592d846df7800334c646ee86