Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2548f058ff7656d…

MALICIOUS

PDF

81.8 KB Created: 2021-09-19 04:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 369aa26b51e8325609e9ecef26f69389 SHA-1: 8ad968fb6206a76a9c77945ceed78403b4af4151 SHA-256: f2548f058ff7656d5a7e15fa2728391b9bd6b6d1999d9cb7e73ff8831e153577
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for delivering malicious content or redirecting users to phishing sites. The numerous external URIs, many hosted on compromised or disposable domains, strongly suggest a link farm designed to obscure the ultimate destination and evade detection. The ML classifier and ClamAV detection further confirm the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://berallebags.com/UploadFiles/FCKeditor/20210911134504.pdf In PDF document text
    • https://wineart.online/userfiles/file/57583891993.pdfIn PDF document text
    • http://abwrva.com/uploads/files/70715997188.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210905195402.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/10326728211.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/lisawekiwedinunowosolewo.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/71619714615.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/siwimefase.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/3803b7fdf48b7c9e17382af070d8d90d/naxerabanejoxunimodasav.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/52551995455.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/gafodotamibubujino.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/3508338185.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/jodomonifadijaruwovoli.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202109080630227663.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/xiwugakokimab.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/91973746466.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/jirijovorewa.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/suwojewoguzomire.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/28061433474.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/ab2d55f76bdbb817079a26bf7b3e7b0b/2952961656.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ae7f406d8---wilesadegapepugizexefadid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=vidmate+2016+download+apkPDF 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_off0000dcf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF5 16880 bytes
SHA-256: 55853165e41959abf798df5d5094fa211ab10a78d25d03714fd881109693ceb7
font_01_sfnt_off00010866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10866 10892 bytes
SHA-256: 577609a6189a4f1e3a0d6aa9793f1a429d50a0975815e0c00d77ebca44c9f7df
font_02_sfnt_off000121b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1