Malicious PDF — malware analysis report

Static analysis result for SHA-256 b549657ba5672766…

MALICIOUS

PDF

79.8 KB Created: 2021-09-18 15:33:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b05e017048510828621172c536107e42 SHA-1: 6099a5cbf58a54601f56ee9839c3d02b26833e9a SHA-256: b549657ba5672766bc18e81c0651ccb7634c7bd0d763998fb24fc16967e057de
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The document also hosts a link farm pointing to various PDF files on potentially compromised or disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/161302d52888d3---pexivesumezimedawu.pdf In PDF document text
    • https://calienglish.com/ckfinder/images_store/files/74615542394.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/50771524472.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210905203104_vez86p.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/pejobudimeduvoji.pdfIn PDF document text
    • http://videocycling.info/files/file/97751625051.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/kijaxovivavalude.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/93054579314.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/kumapoxafifoda.pdfIn PDF document text
    • https://iwistw.com/upload/files/12851518759.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/d3bbc209eef19dce4ca3b64d26e6068f/4593231741.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/xidibofajapanawa.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/vofumixagi.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/56618634756.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/37674329772.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/60962136126.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/94472154975.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/lemologopamuvawejoxidix.pdfIn PDF document text
    • https://mountmoriahcamp.com/media/12553290563.pdfIn PDF document text
    • https://jucariicopilasi.ro/app/webroot/files/userfiles/files/norulapoxarelup.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/doburatadorafosiximi.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/wafobujarutu.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/70017798204.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/vajetadatodi.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/67069126543.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/20926057934.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/8fgrf46pao15m79h9vjciku33b/87919358074.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=wcc+hack+versionPDF 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_off0000d38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38B 10336 bytes
SHA-256: 57f0911a2e6ce94d439c4cf16de15855ff4aa60dbe4a8b1d1f0d329488c28617
font_01_sfnt_off0000eada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADA 17916 bytes
SHA-256: 2875a184056ab9c39612c54201bdacffb8d2f4d894e8d8c69dce6f65af5aabe3
font_02_sfnt_off0001198d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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