Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8eb97227ca83189…

MALICIOUS

PDF

94.3 KB Created: 2021-06-27 02:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a2b81821855dc986fd5263569d7ed32 SHA-1: 9506b555bf46d38baf5bd8348044bfd13689edc3 SHA-256: a8eb97227ca83189236dcfea5f856e11d0c108e10f4880141c42317a5dfe2d66
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of link farms on disposable hosting and compromised CMS uploads suggests an attempt to obscure the final destination and leverage vulnerable infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c14a5bf3fa---7590250705.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d69c7a7ab8---49885054951.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/351e12fec10c1ac145bd9c45276d50fd/givabavuzujidiluvutavuwa.pdf
    • http://goldenteriyaki.com/uploads/files/gajudeligidexukorit.pdf
    • http://andlupa.com/userfiles/file/fuzaden.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/b4ec21769abea0b23f71c1ec56763ef4/fururisaforotimowi.pdf
    • http://clipsttm.com/userfiles/file///ravalesexipevutuvaga.pdf
    • http://vinmexindia.com/uploads/78081510814.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c42dc039955---90050249313.pdf
    • https://asiquim.com/ckfinder/userfiles/files/73791191999.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e044b34a8f---52928913103.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/6560c35396f045163bc399253c02c55b/wimipijenowatoropeti.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/e9a98499b9ddbf0137dab7b9796b5698/xajifedezajuxiv.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160cb906b9928c---kaloderuwuzipigazejeze.pdf
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/542275c9fc636bc9248e179fe2c6cfb7/fufexivegikabuzepo.pdf
    • http://learningkey.org/userfiles/67199737631.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/2b1924bf353e6deffe59788a6955a883/26604370009.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/4c5d38653d64d0f518bc13e743e0cc0a/12404032933.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/12a13fc18c22ccdb64a0bb97d2940198/situsejapuna.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/e15c8d9ef1b12682abfc9ada346ee7e1/44669490657.pdf
    • http://studio5r.com/userfiles/files/redebibijat.pdf
    • http://huiking.cn/uploads/file/161608146625.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b54ebc979---32717468581.pdf
    • http://rotarylaspalmas.org/documentos/file/xosikanuko.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/n2mksq8e825n1gknfvdql6b23i/zufexo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=ap+english+language+and+composition+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d11.bin
2bc4ed37c37dd9a0ad4bddb15ed9c216a86d1f3aefd9ae6819d00045860c02b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D11 17344 bytes
font_01_sfnt_off00013a3a.bin
4970b91996fb8ea54d87bab62a3287d31803bfda0f60c04a6e2ac6921d493419		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3A 11048 bytes
font_02_sfnt_off00015393.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15393 16792 bytes

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