Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7c4a4507d5b1851…

MALICIOUS

PDF

80.8 KB Created: 2021-09-03 17:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 15814f15a7957ccd195278d708fc51b6 SHA-1: 840728589c6639fb80a4126470f5f57c1837dedf SHA-256: b7c4a4507d5b1851e9b1c0a7cdd1f0664012659b2cf52ef25ad0a1e726c8a9e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and the presence of embedded URLs indicate an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/983c4de8ee09f5546513fd884a63d1f1/lidezegowuturemufobasigaf.pdf In PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/96239604444.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/visumurolutona.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/nerazof.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/84187394893.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/mevifizufavawevabuligo.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/82320519994.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/pativ.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/88239520761.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/parosude.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/75201910937.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/78766298669.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/zujufomodonav.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a464b690e---69657880422.pdfIn PDF document text
    • https://wecareprogram.org/images/file/rolitekejadubisenadipub.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/soboxopubasisijaw.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c985ab7c40b---wuxerixidadinevurilizawe.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/savivakijemexowitam.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/gc1obg5g5h9u1jktegup49llgt/32672749889.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/wewefetegafejavekifinaren.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607507a666230---93863435368.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e64a649b3---larejezubabemi.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29d1172d93---kotiguwebelavufaxurige.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/iac3q4kj0f92lm8t3bd6q3r1f6/gasedisurinujuxifolavi.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/bolukuk.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/88364664396.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=portugues+juridico+pdfPDF 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_off0000d3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A3 10716 bytes
SHA-256: 98d6fcfee3e52b29c54fd054d9d534662e49ce9a5ecd5ef1de93c1c025b45541
font_01_sfnt_off0000ec29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC29 19072 bytes
SHA-256: f5d5ae5f61bc5df62508e591687a0b33caf85e326d9e5cdca8b670368a8d83e6
font_02_sfnt_off00011d79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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