Malicious PDF — malware analysis report

Static analysis result for SHA-256 91beb4b394589467…

MALICIOUS

PDF

80.9 KB Created: 2021-08-29 11:37:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f37f1afdf16dc6bb87a456581474da9e SHA-1: f800e7e2f57f2c4abf87c3b7c9136317dd1b3582 SHA-256: 91beb4b394589467c95e5781495f4f6f021d9c1d1c4531be96cb35beb2db7879
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The document contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable hosting, suggesting a phishing or malware distribution campaign. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings indicates a deliberate attempt to create a link farm for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=301+east+22nd PDF link annotation
    • http://kroonzuivel.nl/ckfinder/userfiles/files/lexipobodejamimidixines.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8f5486a28---pilegaxubojat.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/78079916190.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/041pm5t115p1intns08nrr56s5/67497516776.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/92653476291.pdfIn PDF document text
    • http://adveotec.com/img/file/romebabedukozavulezala.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/sewaziganawafobano.pdfIn PDF document text
    • https://gawwaclsc.com/app/webroot/upload/files/49611087016.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/90e21d39396bc4c1e2210b83f25912cc/kiguzoxetawo.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///19873427321.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/98106547116.pdfIn PDF document text
    • http://minhanh.com/files/rofisa.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/44002642823.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/h99u41eokf6h29rlhi2r9nvh79/20411139740.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/d84a4be52709c4e8120ddea18a75856d/16018247433.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a74531cf6---gulesowukexivojegabufo.pdfIn PDF document text
    • http://pneusmarene.it/images/file/juwonimedubebifivoziwa.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/burefixalotuz.pdfIn PDF document text
    • http://king-tableware.com/uploads//files/202108100354221400.pdfIn PDF document text
    • https://teamcode.net/upload/files/folukasobigo.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/ammriccsdg8hmao4vqrh4hhlp4/wuripomafovagopenuzivilo.pdfIn PDF document text
    • http://come2menorca.com/images/file/vifamasevavoku.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_off0000d397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD397 10252 bytes
SHA-256: 3d5f49d814e14bd7fefe51b1a10ebb56e19fed53d7c58f5cd8975ab73bb888ab
font_01_sfnt_off0000eadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADF 19792 bytes
SHA-256: c1c5e24e2f26aed4d4dc22918ccffe6af55dcd874d03441f31b0e5ad09517d44
font_02_sfnt_off00011dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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