Malicious PDF — malware analysis report

Static analysis result for SHA-256 4146df216f8b1e77…

MALICIOUS

PDF

72.0 KB Created: 2021-09-27 02:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 62a492958fe1cf3270efb7e751ecde27 SHA-1: 28378847b9227c668af4063ec9d3c0e3571f4835 SHA-256: 4146df216f8b1e7791dd806086c406e4b3d884fdbea8aae756394951a6439d89
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous URLs pointing to compromised websites or disposable hosting, suggesting it functions as a link farm to distribute malicious content. The presence of JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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
  • 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://mocphatreal.com/assets/images/ckfinder/files/jufirawawobimobeduzog.pdf In PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c68634eab3---kazeguv.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/39355296213.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161492be3aa846---39907960124.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/44509900961.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/87249676977.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///nilalabevalirizo.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/lexigebuzimupotaferawuxe.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/93516142040.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/vuvuw.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/10959541187.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/midexetinufogin.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/79587361196.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413cb0d58b1.pdfIn PDF document text
    • https://kultmotor.virtualbodybuilding.hu/images/files/46068661960.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/suzetozowalepiwevogutite.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/tirivojulovewemipilalilub.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/zaxovajanowuj.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/19663084450.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/05103a5788f8c5b0a98fd16d3b4d471b/21803747729.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/50830855378.pdfIn PDF document text
    • https://buzyhub.com/files/99933216446.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/3160564535.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/62054806536.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=8+ball+pool+sniper+tool+free+downloadPDF 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_off0000b42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB42E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC40 16924 bytes
SHA-256: 1b2cc33021b75cb11c4d6ac5b4a96baa3ed2590ae5dc480c683aeb3c9ac52f89
font_02_sfnt_off0000f77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77B 10828 bytes
SHA-256: 3ce7f65ea539ae4dacc81f03bf9c62abd73e55c43e34872a04abc9e79d015a46