Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ba58f4d1fbc568a…

MALICIOUS

PDF

87.4 KB Created: 2021-09-04 09:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 173baf971957635f3b7aae8dd2502322 SHA-1: 5f25999915bf54c813a182f4b65f51ef3dee235c SHA-256: 3ba58f4d1fbc568a4677c5bd2e548ee2be1c1d74f6a313df32a9fa329e7911b1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm structure, suggesting the document's primary purpose is to redirect users to potentially malicious sites. The embedded JavaScript is likely used to facilitate these redirects or further obfuscate the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://szakkepzosiklos.hu/upload/file/monasasovejigelusamu.pdf In PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/13672937919.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/b245e869115e5dc48b8362209003e715/84077661280.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/gesuzajokaxaxideze.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160dcd7d3f2f75---2783774295.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/33612105929.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/godela.pdfIn PDF document text
    • http://mesterek.net/tmp/sofoximozolubeteruda.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128d56a28a54---tosipukebeki.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/32396011432.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffac737654---kufimapejomanenoz.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb74d84dd4---gewijifekuz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c791500988b---zerefak.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/43167869263.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c6b688597---duziguzifadepagotan.pdfIn PDF document text
    • http://rc-saty.cz/gais/image/file/kuzab.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/28438998728.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/44692944905.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/871619bf0a0dc6829875fb618951da57/12005327553.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/rixuribunozofopasidibitaj.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/d4n0719p5puqbsrkatpe7d3084/wororagedojumuwepif.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/2k30mg2gtk3gpa3kcac9i29n0c/55177383171.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/2ad9282b7eed030b96637afc90d8f7b5/tavorob.pdfIn PDF document text
    • http://classtool.info/upload/files/1134933709.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c24b7f20b93---mamixifa.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/palozavepifekatus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=2011+buick+enclave+user+manualPDF 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_off0000efda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDA 18348 bytes
SHA-256: 1797e52d126b84f15efd72c8e865f8949450164a985738de909f9a184ede394c
font_01_sfnt_off00011f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13740 10768 bytes
SHA-256: e906452147d748b1f55f406ad6acb38c978c4e68bd313f5c0faed6b81b50119d