Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4bd7e224c27b106…

MALICIOUS

PDF

77.7 KB Created: 2021-09-12 08:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1eea3cabf7fa96aa7b915994540e2f4e SHA-1: b391a657cd281df6abd38b7589503922a6a8f274 SHA-256: c4bd7e224c27b1060ab3ff6f1fd14b8a6e892c5807119324e15b9f7da8a42375
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to lure users to external sites. The embedded URLs, while some are marked benign, are part of a larger pattern of redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://hotelamadeustorino.com/userfiles/files/nizudarotinekonajirumu.pdf In PDF document text
    • http://obchodsezlatem.cz/upload/files/75554087946.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/lafovubibo.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613852323d8ea---49661857472.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/buduxixeb.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/rupitaxoragakukumufax.pdfIn PDF document text
    • https://huanghecables.com/d/files/beligunobedezazegumeralu.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/93678458797.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/34661434586.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/debudumovi.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/bazexorudozopeki.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/33849926731.pdfIn PDF document text
    • http://poledance-chrudim.cz/files/file/71446162152.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/91051325564.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/d967183d28749f9845d714147ebcd899/48857054508.pdfIn PDF document text
    • https://aahs.givingplan.net/sites/default/files/editor/file/96847511880.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/26527974952.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347203a6706---16860373669.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/1637018248.pdfIn PDF document text
    • http://perila-vrn.ru/userfiles/file/80056935326.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/35544878043.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/64836148876.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c104cc0b28---dodeniwutuvofegewele.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b8daa510d---pedubokokijunukejokowak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=aloha+browser+premium+apk+downloadPDF 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_off0000ca88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA88 17628 bytes
SHA-256: 91948bb6cb32fab84c0c7cd999c40ca3d6d3804776e751b8fdb09c01f439d32e
font_01_sfnt_off0000f76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F84 10956 bytes
SHA-256: 761d829bd07ea06e1ed2d00ef78baef7d23a617d64e6f24a82ca681bc28d603c

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