Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbfbae1d33e400c4…

MALICIOUS

PDF

90.1 KB Created: 2021-09-03 04:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 22f2c2bb060cbf0a11d49ba79639bf19 SHA-1: 88c976a8192a688ceade98e5e3c743787923db5b SHA-256: fbfbae1d33e400c4ec3eff344c2d75522b9c8b85199f2c84aa6ec51ffb1cd70b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites and other domains, suggesting an attempt to redirect users to malicious content or for SEO manipulation. The ML classifier strongly indicated maliciousness, and the presence of multiple external links supports a phishing or redirection attack pattern. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c672a3c3f48---15794482353.pdf In PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/jvbedlrgn2hktmfe5sscjf5gm0/99948820371.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/22845587685.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/rezimifegafa.pdfIn PDF document text
    • https://lavaecucebrescia.it/file/29321709123.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4510ceb663---lonodixomap.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/pafola.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c427377f2---gufipoferunamowabudaxa.pdfIn PDF document text
    • https://kopari.hu/files/file/dakubize.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/4357422524.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608901aebef62---wijefizabilufuviw.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/16094d815307d3---69234823552.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d09089659b---buzakuzari.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/6566f14e8b3a46561f7ac10cdebde437/lejamixasemiv.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/2469870c6e5f98694bab5d81a4d9b63f/85731849361.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160794a37a0c0c---papuxonefefupivum.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/4sei7ho3o7nceppp83ss0g3gcu/38506395422.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1627695906pirifumamop.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/694562db50dbc3862c2b7755edd85c3b/37197982079.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/14717530326.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/3rm1p926qv62dtachsgj0bdqek/11283300656.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/gifupoje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=bose+soundlink+mini+ii+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_off0000f370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF370 21248 bytes
SHA-256: 08f7ad13f5f578a3d7a56f1e5a5e087a1f11f65218270bee13e2fb36bda4f957
font_01_sfnt_off00012976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12976 10456 bytes
SHA-256: e64238d157939631a3e5a1975c289fc6b8d98890d3e42f8943cd406c9ecfc1f3
font_02_sfnt_off0001412c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1412C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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