Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d05d3760681cde7…

MALICIOUS

PDF

78.2 KB Created: 2021-09-20 20:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 73cb7a6ba4560be6325320c324325318 SHA-1: 9fc14f3a64dbde732c55bf4fe55be5dcbffd4336 SHA-256: 7d05d3760681cde70aedab7dacafbcb2d1346675a79112101fd5347efd88667f
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links to various websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms points towards an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://oceanflowerhotel.com/uploads/image/files/81516676029.pdf In PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/xovafanunizobudobu.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/61519546360.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/14830881072.pdfIn PDF document text
    • http://celesteandtorsten.wedding/images/file/73706586436.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/60212204529.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/18010148883.pdfIn PDF document text
    • http://123flower.doweb.kr/upload/files/fabipugabikasoro.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16143ccac6aa78---wiwegosevimuzajeju.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109090257495639.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/povovanuguxu.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/14615097912.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/ca3d48d3373b4d3699cf102f64d446f1/xamipuro.pdfIn PDF document text
    • http://kleiberit.ru/files/file/vinabolonesapalanet.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161368c092845b---3653343516.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/57879459164.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/tapinobobonabox.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210906_120552.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/2255548381.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/53442221149.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c140eb4d8---77413886818.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/wuzizumutomojikemorezogi.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/nuzufozonoradiwal.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614724cfc6aef---saximifazelasapix.pdfIn PDF document text
    • http://news-hk.net/uploadfile/file///lesadefefumuzimup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=biology+exploring+the+diversity+of+life+pdf+freePDF 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_off0000cb53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB53 10948 bytes
SHA-256: d3a3ee0d1a657485efd79fb1271c2b0ea6494258b1c6d8080ab292935d7ed9ee
font_01_sfnt_off0000e47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8F 18236 bytes
SHA-256: bee726820f8ddeb7f7cfd2fcae62867bcf077cf21da8b5e523c83a5375059eaf

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