Malicious PDF — malware analysis report

Static analysis result for SHA-256 766755bcfb4367ea…

MALICIOUS

PDF

84.5 KB Created: 2021-09-17 03:41:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 36e303d9ff58680be9771c9f8aaa6fc0 SHA-1: fe55900e0f06da921eca7f4215362005014405be SHA-256: 766755bcfb4367ea34e35d262e9211d861dbe88bf56a0e2d7ca07ddcb5482d36
176 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous external URIs pointing to various websites, many of which appear to be compromised WordPress installations or disposable hosting. The presence of a 'utm_term' parameter in one URL suggests a phishing or SEO manipulation attempt. The document body is unreadable, but the heuristics indicate a link farm designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://cructi.ru/uplcv?utm_term=gta+v+apk+download+for+android PDF link annotation
    • http://thietbianninh188.com/uploads/files/39407097339.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/966c26e231cbb9f673eae341cd17746e/66466589408.pdfIn PDF document text
    • https://betsin.org/userfiles/files/13017960664.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/puxofojolowini.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/zedogile.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/78374401138.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/wapukun.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/66265574841.pdfIn PDF document text
    • https://pacientes.quiroser.com/UserFilesQUI/file/kewabakikoruporitak.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/furizezejazowak.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/4261915135.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/54681500018.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6ee7c8b32---37699311377.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/radoxovubewilovo.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161325bbfc4738---51513757604.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/b9a73d2f4faf37f78e50f1bf2de0a4a5/mutunanozisowopobetuvove.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/16368591608.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/2138852664.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee274da3cd---59542022794.pdfPDF link annotation
    • http://gmart-express.com/demo/uploadpic/file/69382853490.pdfIn PDF document text
    • https://matricula.arendic.cl/files/56650013653.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropalaboralbarata.com/userfiles/file/24024126326.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_off0000e50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1D 18148 bytes
SHA-256: 98be1a1383e206da8ce6bb87f4f547af605782470a0b7fc2de926954d7a27d0f
font_02_sfnt_off00012c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C53 10476 bytes
SHA-256: 0bf92c9fe0925c54d4dfd318911b585c5e561f5f85baa2e534420fe671d2d407

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