Malicious PDF — malware analysis report

Static analysis result for SHA-256 e313103afe2f8822…

MALICIOUS

PDF

74.9 KB Created: 2021-09-18 03:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3793d10ed90b114ad4612147f6f81ef0 SHA-1: b9066116c7e722a554c36bc6d00d6c414612a98a SHA-256: e313103afe2f88228ceb2af15daa447c3cbf3066615ccdce84ccac433ca5285e
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery via these links. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8416

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.
  • 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
  • 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://oniceh.ru/uplcv?utm_term=newspapers+online+bangladesh PDF link annotation
    • http://kiavysocina.cz/UserFiles/File/23045767228.pdfIn PDF document text
    • https://31app.com/userfiles/file/77552852807.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b97afd0daf---gasajevododu.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614483b2ba6d1---65178507250.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d50b719e47---87931633283.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/15690117202.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109012230295556.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/lajidawuwoninar.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613510da09d04---57313902169.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9e4d0f184---77566894470.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/temuzigisimofolapi.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/pexomibaxefapejesikavexiw.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021091419072173.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/keniwifulaxa.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/rabomalis.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/4376038380.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/46762261365.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/siroguvevajeboxikufe.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/87106048326.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/11544975432.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/db8pm323l7pohqtq6gm8rb9fiq/sifepazawetovivugutomegub.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/ditidibiloxofegiwinegag.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3ef0b1445468497ebea6069107dd5b9f/3736463240.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6d6d15467---88281296861.pdfIn 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_off0000cd32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE544 18364 bytes
SHA-256: acb63dcfa26a94c43f226150f5cd394c28bf666df1d5b0a5b54df964e7dda13d
font_02_sfnt_off000114ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CE 10776 bytes
SHA-256: ae7bd07014a8d437f7b9310ff52cf901870039caba6563be86cde0be57d02677