Malicious PDF — malware analysis report

Static analysis result for SHA-256 928a4bcfc652e4f7…

MALICIOUS

PDF

67.3 KB Created: 2021-09-24 22:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4844604a1adc8f0cd33ebb20cf81d258 SHA-1: 638b014a9bf73cc25e399acee9d3c69a336079d1 SHA-256: 928a4bcfc652e4f792721a85b1c7f1512f061585ad85b2b2478b5e36c4a4b2b5
176 Risk Score

Malware Insights

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

The PDF is identified as a phishing lure due to its image-only nature and the presence of numerous external links. The document body is heavily obfuscated, but the heuristics indicate it functions as a link farm, directing users to potentially malicious sites. The ClamAV detection and ML classifier strongly support its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://ta-taiwan.com/app/webroot/userfiles/files/54080752018.pdf In PDF document text
    • http://reguitti-engineering.it/userfiles/files/tapedozagul.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/072a8dd207b11f2c61464705b2309356/36584543265.pdfIn PDF document text
    • https://cosmopolitanhotel.lastrada.bg/uploads/wysiwyg/files/29643431961.pdfIn PDF document text
    • http://malerbetrieb-malanders.de/Webseite/pics/fotos/1/file/zinov.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16147323599ce9---15613698620.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109051910446578.pdfIn PDF document text
    • http://hoigolfbinhthuan.com/users/files/sawawij.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/74142442611.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/1135717123.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/42164929504.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16148c581d1930---36254145296.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/82595483755.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/54759997230.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/batipe.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/33493421994.pdfIn PDF document text
    • http://novichiha.ru/pic/file/93287067664.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/bixero.pdfIn PDF document text
    • https://franchisevisions.com/broker-site/files/files/pawakoxekigexowofinomu.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/xolaxirotunuxezijo.pdfIn PDF document text
    • http://accutindustry.com/Upload/files/20210922132554.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=download+jcheater+san+andreasPDF 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_off0000ab0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC322 10592 bytes
SHA-256: 19f77465494a1f8003375bc16c8166672a0cf6e8f72eea4baa7bb8ce07d2ac62
font_02_sfnt_off0000db5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5A 14220 bytes
SHA-256: f2435cd2007b56319d4ed603f8be48dc2e587108c212a761ec9c1c621f6a7795

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