Malicious PDF — malware analysis report

Static analysis result for SHA-256 64c42473aacf4e60…

MALICIOUS

PDF

79.9 KB Created: 2021-09-13 02:21:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7a599260e18675665cb238b13e48a3b3 SHA-1: 609f20e10689edcf4bb5e0c92297b233483c1772 SHA-256: 64c42473aacf4e603b4cc9e3c9b641959df7562205e0aabbbc210ab98a271de7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of multiple external URIs, including a link farm hosted on potentially compromised WordPress uploads and disposable domains, suggests a phishing or malware distribution attempt. The heuristic 'SE_DOWNLOAD_BUTTON' further supports the idea that the document is designed to trick users into downloading something.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=supersu+android+8 PDF link annotation
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/mevotewewadolota.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/55082739025.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wewilodibixubope.pdfIn PDF document text
    • http://potya.com/fobadu.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/72053523545.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/8947569656.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/misunifuritovu.pdfIn PDF document text
    • https://longhoang.vn/upload/files/41631715958.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/68729659229.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/pewimeduke.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/sotuvapuluwimi.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/bexizurosadadisisegil.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/kefezawiv.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161367aa18921b---wewizeboforojezijogi.pdfIn PDF document text
    • https://clubon.top/uploads/files/64917958533.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109111536367894.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/vozejegumovok.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/zutaxo.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/6751009755.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/3b45fc37426d39d5cafc4ab46d5291a0/pisotizo.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/20966817bcafddb11182a68d2da218e9/xedejobojizusu.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/70699036914.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-8/20210908175302676653.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c7bfbcd91---lozuzopesufobebede.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_off0000d343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD343 10624 bytes
SHA-256: a04d26f2f3708453beecb5e4b770743cf1cbdbe6d683b40c4ffd824de6759da0
font_01_sfnt_off0000eb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB93 17908 bytes
SHA-256: bd26553723f55e43aeb1207ac6858b2be4085a3bce369fcb79ff6ff755d95a3e
font_02_sfnt_off00011a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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