Malicious PDF — malware analysis report

Static analysis result for SHA-256 055e8ad7f7da21a5…

MALICIOUS

PDF

83.1 KB Created: 2021-09-17 18:38:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: abc13b82974a0b7a0954b259c46f46b3 SHA-1: 561e85536d64a9d280488c657764dbce6bb073e1 SHA-256: 055e8ad7f7da21a5caa16a855b59aeaca813a59f2c14847fdc1d7bdcd8cbd1b3
196 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing and trojan delivery attempt. The 'Remote-support tool lure' heuristic indicates the document likely instructs the user to install or connect with remote access software, a common tactic for gaining unauthorized system access. Numerous embedded URLs point to potentially compromised or disposable hosting, suggesting a distribution network for malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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 http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/161333bc12915f---rivurowonugizig.pdf In PDF document text
    • http://thepducphat.com/upload/files/polojaj.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202108311713188625.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/69189115057.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16317146483639.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/2c00a36690942bbf45d7d6e2b2aed55e/paserekovimagibatu.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/46260995661.pdfIn PDF document text
    • http://runwellconsulting.eu/file/file/15068531845.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614407be7d5f5---liketen.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/rutod.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/sesojobefozaxuvosevitovin.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/xuwulutobisokukukajexoni.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/tabaxivosuvor.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210916005500.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/tawapiguze.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/xurikikurefanepodopivox.pdfIn PDF document text
    • http://spakimthi.com/upload/files/zaxegedukubufokib.pdfIn PDF document text
    • http://ipceurope.be/assets/file/63192312275.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/93af42f2162f76c6fc410026319b8353/20074621597.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/kozazozuwedu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=android+remote+system+monitorPDF 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_off0000e139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE139 17676 bytes
SHA-256: 2e1035452e6c119c5ec2bc6a806d0a22ca2bf6a5ebebc4f79139c3111a433677
font_01_sfnt_off00010f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F59 10296 bytes
SHA-256: 9d76a03f9c569f95248bcef0514aa60211c015e17f12ee9165919c9f5d856444
font_02_sfnt_off0001268e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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