Malicious PDF — malware analysis report

Static analysis result for SHA-256 a33c1b898bce519d…

MALICIOUS

PDF

83.9 KB Created: 2021-09-12 18:32:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 73943af9e9caa53f9dcbb8e7713f1cd9 SHA-1: adf8f161ba940112a54601ee35dfd486ec95b914 SHA-256: a33c1b898bce519db53688e8e0f1138605d4058db6cba65832ff44cd1ced4588
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. Several heuristics indicate that the PDF links to compromised WordPress sites, suggesting it's part of a link farm designed for SEO manipulation or phishing. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/d8de1c6cc50724a09bdcae41aa3abc98/vufukojeguwoze.pdf In PDF document text
    • http://teresachild.com/upload/files/7452940008.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/wowesuzakuxitivo.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/31712543954.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/bokeborusuravojosun.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/wevupap.pdfIn PDF document text
    • http://kasargod.net/uploads/file/49070632744.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16135905a7cd88---55419648612.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/jonakog.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/2690b8d27d3cbc72bcfd5263b7098f29/bifugareretosal.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16139770b7f60c---sasivib.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/56628282471.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/47817719321.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090519561573499.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/51175837623.pdfIn PDF document text
    • https://websbag.com/uploads/files/fumametuvakekumiwabawux.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/81938897855.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/64172511433.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138b8bf00426---nulugag.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/35675641420.pdfIn PDF document text
    • https://tarsiman.ee/files/file/57584804582.pdfIn PDF document text
    • https://digireg.org/upload/32797289662.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161370ef0451a9---tozuwifeguxuja.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/70484069622.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/duxunuvijiroxev.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/6437356969.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=jogos+do+android+para+pcPDF 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_off0000e2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EC 19412 bytes
SHA-256: d9d58a79da01235beb8b4a42d71e2d49973657f228f6feca42cefb028989cc04
font_01_sfnt_off000112a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012abf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABF 10404 bytes
SHA-256: cf5404b775bc539406696ef56279996d62748ff33a837c8384ae776afa17d521

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