Malicious PDF — malware analysis report

Static analysis result for SHA-256 63e3e9b1367b3486…

MALICIOUS

PDF

83.7 KB Created: 2021-09-16 16:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b6dc3cfb20f0fda17ee46eaff693ab39 SHA-1: 1e7e07338a1ba983b478bc8f78361cb4ff2442ee SHA-256: 63e3e9b1367b3486b0db4878706fd2b2b9b888e59ff90404cbb2617870ea89d9
196 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. Heuristics indicate it contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution lure. The 'SE_CLICKFIX' heuristic further suggests social engineering to trick the user into executing commands, likely by clicking a malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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
  • 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.
  • 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://artasedanasingaraja.com/uploadfck/file/89344410090.pdf In PDF document text
    • http://kantipursecurity.com/userfiles/file/9902615019.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/52234865867.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86056449010.pdfIn PDF document text
    • https://alpinashop.bg/files/tiratesuzorezojeb.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16133c6fb13071---diwedewet.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/41065576610.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/zajejulemudagewa.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/26165204803.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/35550628634.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/neludegexuvug.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16140e89ea2a30---vezasatow.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/16826949641.pdfIn PDF document text
    • http://sintniklaas.kinderopvangpimpeloentje.be/ckfinder/userfiles/files/57519798601.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/witaneritameloba.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/gasalezagomaxarajesu.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/47621725274.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/xuruxemaru.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/30755422418.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/bulozoluzote.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210901_025348.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/tozekiguvotufikugebo.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140b9a5c3015---15819399111.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/zipofalilodimavejituxejiz.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f1d06d850---nitunilenexemaxubeti.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/74494164335.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+get+ip+address+of+wifi+in+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_off0000e042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE042 10704 bytes
SHA-256: 9782e2593d2afb24707539c5e654757f9fad0071e35e7a57bbc5db02697964a4
font_01_sfnt_off0000f8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DF 18492 bytes
SHA-256: 4b7b487bf905224ff74f569da60a3ca54b588aa4642606a551263254540e47ac

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