Malicious PDF — malware analysis report

Static analysis result for SHA-256 16059403b462e583…

MALICIOUS

PDF

85.3 KB Created: 2021-09-17 19:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 15821a5a2fcb780104c328bdb10e712c SHA-1: 32aca403e3e9906fa41e3914c5027092c193200f SHA-256: 16059403b462e5832c731aa8f9efa66ee5579f9323a03e4a4b94ddea0035ba05
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload storage or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.profiemg.cz/upload/ck/files/jurejugubuloraw.pdf In PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/lolanedetirajaluj.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421ed7e7e4c---53833471700.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/xinifiberupodoruni.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/jiwuvomedapixexegenunog.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/32534527946.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/zunalowisiz.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/nqlbigtdm2o1gi5ig3f0oik0uo/88608508249.pdfIn PDF document text
    • https://texasbordervolunteers.org/userfiles/file/38364366125.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb3554f161---12174875823.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///neseloxevusufamojanuzised.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/929ec8c585af6c205b840c8140639687/zunolatevijuw.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/bobutivijasapagune.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cbf64f40a---4796703164.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/66217991581.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/43795788911.pdfIn PDF document text
    • https://synersys.fr/contenu/file/dejawo.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/e4f341kd5tjpmiesm29r84a948/moduxiluritosatoka.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/vakenuvokebijozedo.pdfIn PDF document text
    • http://protok.pro/upload/files/loselunogotel.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///55980337989.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/vebeloxozasoforike.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/buririzewalobi.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/tifelaloxugolotenaw.pdfIn PDF document text
    • http://salwex.hu/file/mopizowunofe.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161390a6699613---nutonagu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=virtual+wallet+app+androidPDF 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_off0000e8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B5 18468 bytes
SHA-256: 36bb3e591869e60cd22c1f4a41829dabed9ff826eec2ccf55ca8ca4a6d69dc1e
font_01_sfnt_off0001182d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182D 10372 bytes
SHA-256: d81377548eb01848796e44ab1e982b24b77724c22b834290aaea8b991a4b185f
font_02_sfnt_off00012fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1