Malicious PDF — malware analysis report

Static analysis result for SHA-256 188dd66516fb9224…

MALICIOUS

PDF

82.4 KB Created: 2021-09-15 15:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ab03804d98c7a0386495f6057a4b105c SHA-1: fbd9b9f3248b4bfa2efabd12dfed70cb49857eb8 SHA-256: 188dd66516fb922455451aa5fce5d284f10d9ac76ac6beea27696da24ddcb9db
204 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 User Execution: Malicious File T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and multiple external URIs, indicating malicious intent. The 'SE_CLICKFIX' heuristic strongly suggests a social engineering attack designed to bypass macro restrictions by prompting the user to execute commands directly. The presence of numerous links to disposable hosting and compromised CMS uploads further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://synerhu.ru/uplcv?utm_term=automatic+voice+call+recorder PDF link annotation
    • http://perles-del-beya.com/userfiles/file/tepapovanifafega.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/zugewogerulema.pdfIn PDF document text
    • http://yejida.com/userfiles/file/54526375626.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613a35fab418f---65223072756.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/lonuta.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xakodij.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/27580212723.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/jivusizubaj.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/rasawobejimejiwan.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jiduxesarotikek.pdfIn PDF document text
    • http://erdbau-rauch.at/dijapuboza.pdfIn PDF document text
    • http://diagcorlifescience.com/attachment/file/66480314256.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/bexajomo.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb69be36e2---guduwofajuzerezaxolemakad.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/lebawesap.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/9f5fb1fb4507d5a40a7b3748ae083625/domulajo.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/rebewep.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/kunapododinigo.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/5vmao478s4r9cn468edi768a24/maxuriwopipabekebizovikar.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/zudul.pdfIn PDF document text
    • 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_off0000dedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDF 10404 bytes
SHA-256: eb11200519eb9942a8b92be072f64b617c55dd3db148b3c1fe4fdcf47fbd8d9a
font_01_sfnt_off0000f679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF679 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8B 17652 bytes
SHA-256: 2443b4128aa7e11eee491c3a4e2a6f0d940a1e536e0568df26885c80d71676d1

Open this report in the interactive analyzer, or submit your own file for analysis.