Malicious PDF — malware analysis report

Static analysis result for SHA-256 822680c34d227439…

MALICIOUS

PDF

82.0 KB Created: 2021-09-20 02:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ead10dd1bb3ad2df8a8980d707b295fd SHA-1: a65493de9ff50108a573c36aac23634c77b14cad SHA-256: 822680c34d2274397e143ce452316dd3fb3cf1356f233e700f941447fa98c8d6
236 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate it employs social engineering tactics, specifically a 'ClickFix' lure, by instructing the user to copy and paste commands into a terminal. This technique aims to bypass macro restrictions and directly execute malicious code. The document also contains numerous links to potentially compromised WordPress sites, suggesting it may be part of a link farm or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613077bfe35b6---52871779540.pdf In PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f84c4858d9---40854607707.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/tulikikupori.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/pixobero.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/35617399697.pdfIn PDF document text
    • https://stancijanegrin.com/userfiles/file/5140768660.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/4439abaf6e15dfa0883f3b8677808c8e/20557008879.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/jurabuxojetugaweguvaduga.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/kexinofomin.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/74336226137.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/73585475896.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/h7ge9orhibe3um4stc3opf824a/19871278084.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329c5bbe98c---7854666406.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/kubujuzemi.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/82891591698.pdfIn PDF document text
    • http://susutour.com/userfile/file/pubudifuwapubalowamex.pdfIn PDF document text
    • https://maximaainfoways.com/WebExams/ckfinder/userfiles/images/files/96484957285.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/78259536215.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/clqevmmd6qhias48q970587nm0/koralipapotesokogelurekav.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/xosadamiwerulunapa.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/kipotaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=where+is+android+sdk+folderPDF 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_off0000d76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76F 19628 bytes
SHA-256: ca03c7fcc1fdf77583c582941d5ba1fea18c553c0b1191852e2376387b6a379d
font_01_sfnt_off00010a8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8A 10436 bytes
SHA-256: 5e7dfeff883dfe2f0a261960b3685957e5299e49ffb056ac932113650bd31696
font_02_sfnt_off00012224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12224 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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