Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3f977c75c8611ee…

MALICIOUS

PDF

79.4 KB Created: 2021-08-22 03:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a717214bb733aa57315ce76af0006343 SHA-1: eb1922b5e1f810ee342beb13195b78c9d5226986 SHA-256: e3f977c75c8611ee09c2470c5fcc0e7d4f8b5e9fe4159c7f437f8cb902f2b352
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Numerous URLs point to compromised WordPress sites and disposable hosting, suggesting an attempt to lure users to malicious content. The presence of multiple PDF link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c788bd296f---talibefibinox.pdf In PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/xofebaweropegukerigisa.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9828243ec---banodekemigaropojigenom.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/v7g3c8gstrci9toqen290h0ir7/tonodufinotup.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/14630365637.pdfIn PDF document text
    • http://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/bibolamod.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160803c9ca5792---23598268200.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bffc3c43476---nebekozosurovowafapulozol.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078148f27b0d---29588842530.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/10f57a0841307126cfec34ff5eacb052/kimexoluvigox.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/17779483884.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/38117108185.pdfIn PDF document text
    • https://daismene.it/file/butuwirap.pdfIn PDF document text
    • http://modra-skola.cz/userfiles/file/fetovabox.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/21314314790.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/5620905858.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/wirutaxokomazikosiwukozib.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/vilafenosemaforubi.pdfIn PDF document text
    • http://caf-ljubljana.si/docs/zisokolagamajojuzenegoxeb.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612017cf638d9---51929814819.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726eb5cdbc0---54350516222.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/10838562007.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/jijenemawigoganeropotozef.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b01e60f2ff9---7854218391.pdfIn PDF document text
    • http://eraucheta.ru/uploads/file/witeneponamamofimunenulub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=translate+verbal+expressions+to+algebraic+expressions+worksheetPDF 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_off0000d2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B4 11100 bytes
SHA-256: 85d48cd92f9d166adf664164395ec3a179e515aa6ff36e7558b4a63cfbdd2919
font_01_sfnt_off0000ec6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001047e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047E 16500 bytes
SHA-256: 4f67d4a11b8cae529d44d370adebd2b6e62ce6e844756547f93670fcb6f85fa2