Malicious PDF — malware analysis report

Static analysis result for SHA-256 2576e4fc06fc220d…

MALICIOUS

PDF

96.2 KB Created: 2021-09-17 18:07:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f6c725751470fd33874827de5aa4649f SHA-1: 1520e9510c31b5eb476a1048fd240484f151b534 SHA-256: 2576e4fc06fc220d8d38c43348af906310176531dde75e04b6b0b7b02762bfb7
196 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it is a browser extension installation lure. The document contains numerous links, many hosted on disposable domains or compromised WordPress sites, suggesting a phishing or malware distribution campaign. While no scripts were directly extracted, the nature of the lure and the embedded URLs point towards an attempt to download and execute a second-stage payload.

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
  • 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 http://duda-tech.pl/dudatech/upload/file/60730302343.pdf In PDF document text
    • https://beautifulhairstore.com/upload/files/zajofofisofemepubasezu.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/77e29ec45be5779e0d32b075c6dd1345/42206042996.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/zagoxonunokatov.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/58277519142.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/781775759.pdfIn PDF document text
    • http://www.klccpa.com/userfiles/file/In PDF document text
    • http://teleinwestor.com/userfiles/file/71367683627.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/zexexoge.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/330db869201b1c2fafd0ef7192398e99/feriwenulu.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/wixurizuka.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc7c16bdfd---6755301055.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/33063291846.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/40d074842d620fcd7e6fff7d91dab45b.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/72351123026.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/pisurovurujam.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/bixunumujitived.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/sazaxaxufo.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/sakifemapule.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/xejijisi.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/72108733596.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=ms+word+on+chromebookPDF 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_off00011268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11268 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7A 18956 bytes
SHA-256: 52f5b73f1736615926905c59214a03cf17bd4d7ad10945fe57ab29e78be35d04
font_02_sfnt_off00015bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BC8 10548 bytes
SHA-256: d5f6af717a0f3bc6d9f204bc58ef5a769005b437c6969c67d67f5b4a6a394165

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