Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac0c45e83fecee60…

MALICIOUS

PDF

80.7 KB Created: 2021-09-13 17:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 063e5dec98db0205329879ae3906f39d SHA-1: dccff4ba8639e8bc833bf3ca95e3b54ffcaa5f11 SHA-256: ac0c45e83fecee602b46f2ec09e403043ab9fd055756fae36bb634122339c6cc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised WordPress sites, indicating a link farm designed to redirect users. The presence of embedded JavaScript suggests potential for further malicious actions, such as exploiting browser vulnerabilities or downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://vestol.bg/files/file/dolesulubabomu.pdf In PDF document text
    • http://ooexperience.be/assets/Image/files/45569487391.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/binagowati.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/bivijuvugifuxiju.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/9351615652.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/gejuromumalin.pdfIn PDF document text
    • http://metabolit.ru/files/file/83496573244.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/84464856995.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/madakibevoteta.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/xivabos.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/baparoropativujizibamuzi.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/vabedovuvusetifajaba.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/2e19pqrcdrvehoar3gonqn9kb6/35730318117.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/vatudoko.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/vavovazex.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/90345990432.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/bafasubizuwane.pdfIn PDF document text
    • https://zzwgjx.com/d/files/roxoxav.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/xotelovesilitefetifir.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130340fdbe3d---72896711829.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/zamiwodibe.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/febosupavibototekokizev.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/594af27a50d82046698c7d4dea6fe07b/65965189730.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=barcode+generator+app+for+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_off0000d79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79A 17624 bytes
SHA-256: cb80f01b6ad76f76f47f275b45b779a0029147a8bb76295a2bfb3af2d31f9f60
font_01_sfnt_off0001051e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051E 10632 bytes
SHA-256: 4dc718691647a633b5a7c4c621c911058304fee52e377e67c5ab5d892ef74155
font_02_sfnt_off00011d63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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