Malicious PDF — malware analysis report

Static analysis result for SHA-256 542b460f0697c251…

MALICIOUS

PDF

81.1 KB Created: 2021-09-04 01:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 491a861b59d88153dcde00ef3629e8d0 SHA-1: 7f26be1383faeec98afcc8ec02675bbc82681167 SHA-256: 542b460f0697c251f2b893fd127984cba4a7b27296a40ba72ff4aeb21e603459
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by 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 0.9968

Heuristics 5

  • 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://queure.ru/uplcv?utm_term=hotpoint+ariston+aqualtis+user+manual PDF link annotation
    • http://baheth24aqari.com/ckfinder/userfiles/files/wesesolituroruxosaderewe.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/57d361e9f1099152e88f8825b9f2bc71/fivatozasupipufogojopogo.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/1041159472.pdfIn PDF document text
    • https://paymentor.nl/uploads//file/21456591958.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/c454d3a3e53d896ba1845cc801617852/93095242527.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/55835966423.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/6f64cdfb818958cd025e3c456322735a/58335266669.pdfIn PDF document text
    • http://brlairport.com/images/file/19234559444.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608837c238c4a---65201603416.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/76515318311.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/fadom.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608e25020cd61---kamitilatabanomagizubopes.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/75740212900.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb09f281d8---japezozuvowanojixif.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed2a08f152---71831426467.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863709706b1---98264011967.pdfIn PDF document text
    • https://magnificenttreks.com/userfiles/file/sojenirujimorunuri.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160813c2f62672---84656990040.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/07b79fab8bd7e62f7128778537b049a9/sibelatigibupafojazaze.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/34072949165.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/mewije.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/82jomh72e6m4gdgequae7bplep/telizibuvebeza.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_off0000d67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE92 10652 bytes
SHA-256: bf6e8bd27da6bbadaa49b0b6a306e9e87e08771d5fdd0ce3ea33becbd2aa4237
font_02_sfnt_off000106e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E3 18380 bytes
SHA-256: 3cb8c2c5728b41024e0363c46e3ddd7e453ed8755a733736ae3aca204d824b54