Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c4d48859eb2da38…

MALICIOUS

PDF

78.8 KB Created: 2021-09-19 23:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7e36f0933e6a3e0f3d38c895878831d4 SHA-1: 628a98208e183fd2deb23310f57ea58bb74b7206 SHA-256: 9c4d48859eb2da38d5723514836587cc0f814de7f1350cc10b663e8082876814
196 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it uses a 'browser extension/update installation lure' to trick users into downloading malicious content. The document also contains numerous links to potentially compromised or disposable hosting sites, suggesting a phishing or malware distribution campaign. No scripts were extracted, but the overall pattern points to a social engineering attack designed to compromise the user's system.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://adminico.nl/userfiles/file/xebekusetukejafodes.pdf In PDF document text
    • http://arcenevents.nl/site/upload/files/mofitogigezenojazepaxukit.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210901_912186BDDE2FCD26.pdfIn PDF document text
    • https://ysh.my/userfiles/file/49958611088.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/mavubogavovem.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-17/20210917072214966886.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/62254028718.pdfIn PDF document text
    • http://geose.ru/userfiles/file/visewudepesisepodinakufo.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/gobofutadufudalozupobizi.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/38969753467.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/puxini.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/sarujigurumuro.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/ac46c8157891cea5b72f7ab20f37b00b/jabezofijukirubu.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/76c47f8af22ac281854d14cc2cbc1d1f/fogirazavigezisu.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/fotitalari.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-12/images/files/15248967154.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/jemosejanosula.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/15f02a2592e3cdcfadba601c54fad582/naxixunumeji.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb4c1e13f4---mibetatapuvupuwomovu.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/zenaxemaboz.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/30633749550.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/41085450885.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/vipamitimegi.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/93154781465.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=windows+10+download+chromePDF 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_off0000cd8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8B 18244 bytes
SHA-256: d4873e1c8c1b0341d5c06cf094d2aa3c4d89945043c28cb3f607cbed7756ef7d
font_01_sfnt_off0000fd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11546 10792 bytes
SHA-256: fd45b40da067bf77d7704418dfb7600dc38a06dce0767f4399fc5c565d87433b

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