Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb6e0cc0f687a703…

MALICIOUS

PDF

81.7 KB Created: 2021-09-20 07:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: bd0ceb0525151059ac3767cd3df24bce SHA-1: 7d72b8690217e4b872e8de98650533a1667a6e1a SHA-256: fb6e0cc0f687a7032c107a776e1e77cad95a27e10f762850a567fd9548e4a2bf
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external files, many hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into downloading malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ytdrive.com/CKEdit/upload/files/18368313999.pdf In PDF document text
    • http://opersan.com/file/fedewademupibowo.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/nosipidoresa.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/2463154068.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/60288158459.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/budumawa.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/654b03b408322b8af8e3f59a825c1bea/50632106256.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/94209525349.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/tavirujokufex.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/16230090110.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/xofixam.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613fccae1555e---winebujogepowukazubu.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327e69d8553---7154498184.pdfIn PDF document text
    • http://chenruichem.com/upload/files/42306029358.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/63958506037.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/fizedisuvu.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/38252926029.pdfIn PDF document text
    • https://tekartltd.com/upload/files/noxidalopevivenoti.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210919032312.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/rubapanul.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/65496288699.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/fiwosi.pdfIn PDF document text
    • https://speculatio.in/userfiles/file/12552163010.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/62150777873.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210919191511In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=dragon+ball+z+tap+battle+mod+apkPDF 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_off0000dbcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E6 10768 bytes
SHA-256: 8d0029853efbb8f0cc8c07579712688abea39604e4595a0071c2c848d35a5404
font_02_sfnt_off00010c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C38 17372 bytes
SHA-256: c887f04f3cf24fbf5dd5f7a6b96b47d3520b5b5962b77276d8d82e95447c8caf

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