Malicious PDF — malware analysis report

Static analysis result for SHA-256 63fb0f656ce537fd…

MALICIOUS

PDF

84.7 KB Created: 2021-06-22 09:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: fef1fdb145f4a84085b94094946175c4 SHA-1: 7f620afdff26b99f3b1c11082c7b978a1379796a SHA-256: 63fb0f656ce537fdee2c357ae5e4c7b33b14d375758fff306d5de2decf027cea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://inwebjor.ru/uplcv?utm_term=r+kelly+albums+zip+download PDF link annotation
    • http://asbazainville.org/userfiles/file/vijasorisabasutafomed.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/nj3400c30alb6fi56t7u92qh72/5948257037.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090174348425---wabalirivufavixoz.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609dabaf9c7af---rumobikumakali.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/6bt66pk65ed3gkm2qcpfns4dgs/72273922372.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/00eb8rov01hoatnsdmci4fdkcp/77472247240.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/9188f5183d0726025e0c9aea294cfe38/27211654500.pdfIn PDF document text
    • http://alwaysfavorentertainment.com/clients/879371/File/basilokesejotosusuwenak.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/72291316256.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/6k4jtf6s7bm6h1te6nbv3jkeg3/203493267.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/31736678323.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/kfbrouki17r2ll6qlkvgqm28v0/33543881920.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/mojimidudovukogup.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b8396c1a6d7---78399809922.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/m3aohiosgtmp0omv3hma19lr96/67448952390.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/9589k9vkrimgo147op469vtocb/61151024660.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c1294522104---mazifu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB84 5464 bytes
SHA-256: d71d2e6444d222d238f240daa3b5ba79d06fd078f5e7f03324f61e6ed3665fec
font_01_sfnt_off0000fe26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE26 2108 bytes
SHA-256: 7d7e75cdcda6c9e5b1f81adcd84984272c713bc1d1248ee784f901eea417b8b4
font_02_sfnt_off000107d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D1 12096 bytes
SHA-256: fd808ea5debab047a9b84250314f23d1a333837a5e590c6fecfe5175d6be7f37
font_03_sfnt_off00013017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13017 16120 bytes
SHA-256: 806ffcb3fd98075dd6257ee0a076487e699232ce8131e1d6a8dac34fdbca3a45

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