Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c5f5697913f086e…

MALICIOUS

PDF

94.1 KB Created: 2021-08-30 03:59:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3401301e430cdedb168fc1ea7dbfafb5 SHA-1: 6d555f2c50eeee7e6935808326a7ede1b8ae36cb SHA-256: 6c5f5697913f086ea8bba5b22c607d4b16719282238ee9b59b23ebddd0302bf3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains numerous links to external sites, many of which appear to be part of a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely prompts the user to install a fake browser extension or update, a common social engineering tactic. Although no scripts were directly extracted, the presence of external links and the lure suggest the PDF is designed to facilitate the download and execution of a second-stage payload, likely leveraging a browser exploit or tricking the user into running malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://ketchas.ru/uplcv?utm_term=torrent+search+engine+2021 PDF link annotation
    • http://baigeleather.com/userfiles/file/70297787891.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210613111102_rt1o0h.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/tibofavudopaguwinamel.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2ab1be8f9---jedinowimugigipuxebonus.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/paxunumubozatikepipa.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/29830179735.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/dfe59a880df1d19ea3899c5d5cd800c9/suzifopix.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160745fbfb424e---fumukepip.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/koxezuxuxenutiw.pdfIn PDF document text
    • http://aurora-c.jp/files/files/sufeb.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2f84abd6f---farulezolu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114928f4240f---41302082248.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/75291886080.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/kikevarajakirufexuxasor.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/36181bc768f79a54d6d0793943a717c7/94606522277.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/tuboxoxewizotad.pdfIn PDF document text
    • https://cahayamimpi1.com/contents//files/puvifotupojatajenadek.pdfIn PDF document text
    • https://www.qualityitalia.it/ckfinder/userfiles/files/37734235839.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/43393618311.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/gudajezogafas.pdfIn PDF document text
    • http://ahchala.com/img/file/lipotufimopobudesivuxubot.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/43137473508.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/54734801530.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee85436b03---36690101379.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_off0001093e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12150 18144 bytes
SHA-256: a319d21819da822f09db93d9e122ee021fac5e045bab016567ca08643ce1a4f9
font_02_sfnt_off0001512b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1512B 10720 bytes
SHA-256: 74a85df9f1a4c32e109f5e0d5f460a71e450659b0975c28a329afb00f4b47b67

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